As far as we can tell, yes. Rangers in Kaziranga park have killed 72 suspected poachers between 2007 and February 10th, 2017
Here is a report from the BBC from February 10th regarding the park and its policy.
Its rangers have been given the kind of powers to shoot and kill normally only conferred on armed forces policing civil unrest.
They have a chart approximately halfway down the page that indicates that 72 poachers have been killed in the past decade, the majority of which were killed during 2014 and 2015:
There are actually some parts of your linked story that may have been lifted directly from the BBC article.
BBC - At one stage the park rangers were killing an average of two people every month - more than 20 people a year. Indeed, in 2015 more people were shot dead by park guards than rhinos were killed by poachers.
BoredPanda - However, more people were shot dead by park guards then the number of rhinos killed by poachers.
Another article was published by theconversation.com a day after the BBC article.