I think this is just CNN not understanding that EU consultations are not a typical surveys (i.e. with representative samples) as they claim in their previous paragraph:
The European Union is to propose ending twice-yearly clock changes after a large-scale public survey, European Commission President Jean-Claude Juncker said Friday.
According to Juncker, more than 80% of EU citizens want to abolish daylight saving time and instead remain on the time used during summer instead.
The Commission's press release did not try to pass this as something else than it was:
Summertime Consultation: 84% want Europe to stop changing the clock
This online consultation, which ran from 4 July to 16 August 2018, received 4.6 million responses from all 28 Member States, the highest number of responses ever received in any Commission public consultation. According to the preliminary results (see annex), 84% of respondents are in favour of putting an end to the bi-annual clock change.
European Commissioner for Transport Violeta Bulc presented these preliminary results to the College of Commissioners that held a first discussion on the possible next steps. Commissioner Bulc said: "Millions of Europeans used our public consultation to make their voices heard. The message is very clear: 84% of them do not want the clocks to change anymore. We will now act accordingly and prepare a legislative proposal to the European Parliament and the Council, who will then decide together."
Granted, the EU Commission's press release is a bit coy of stating clearly this is not a survey with a representative sample, e.g. like those organized by Eurostat. I guess they underestimated the lack of knowledge on the nature of EU's public consultations process in the press over the Atlantic.
Junker said in the ZDF interview linked by Henry something similar to what Bulc said, i.e. he said some thing about "millions", but I haven't heard him referring to specific percentages in that interview.
Also the CNN story had other mistakes as it contains a note
This story has been updated to remove a reference to countries that were incorrectly identified as bordering Finland.
So I'm guessing it was some kind of rushed or poorly edited job.
Also they have this translated quote of Junker
"Many people are contributing to this debate. We did a survey, a public survey. Millions responded and think that in the future we should have summertime all year round. So that's what will happen."
I'll let somebody else comment if they translated that properly ("survey, a public survey").
Euractiv translated it the same way alas:
European Commissioner for Transport Violeta Bulc was responsible for presenting the results of the survey to the College of Commissioners, prompting the announcement.
She said: “Millions of Europeans used our public consultation to make their voices heard. The message is very clear: 84% of them do not want the clocks to change anymore. We will now act accordingly and prepare a legislative proposal to the European Parliament and the Council, who will then decide together.”
The commission’s plans are a direct response to the swell of public opinion on the issue. “We carried out a survey, millions responded and believe that in future, summertime should be year-round, and that’s what will happen,” Junker said to German public broadcaster ZDF. “The people want it, we’ll do it.”
According to heise.de a separate representative survey was conducted in Germany with 73% wanting an end to daylight saving time:
In Deutschland hatten sich im Frühjahr bereits in einer repräsentativen Umfrage im Auftrag der Krankenkasse DAK 73 Prozent der Befragten gegen die Zeitumstellung ausgesprochen. Rund ein Viertel berichtete, schon einmal Probleme damit gehabt zu haben. Etliche Menschen leiden demnach nach dem Uhrendreh an Schlafstörungen. Zudem wurden Konzentrationsschwierigkeiten und Gereiztheit als Folgen angegeben.
So yeah, the Commission may have been not sufficiently clear about this, but at least with respect to Germany (where 3 millions of those consultation respondents came from) the consultation results are not too far from what a survey with a representative sample found.