Yes, this is true.  [This episode is available here in the UK](https://www.bbc.co.uk/iplayer/episode/p0g9f9cn/transformers-earthspark-series-1-17-home-part-1), one can skip to 10-30.  It is quite jaring, the background music also cuts out for a secod after the words "my friends" and then returns with the next scene.

The presence of a missing conversation is confirmed in the [subtitles available here](https://www.opensubtitles.com/en/subtitles/9499799-transformers-earthspark-s01e17e18-home-pt-1-and-pt-2-1080p-pmtp-web-dl-ddp5-1-x264-whitehat).

> or other non-binary people.
> 
> Non-binary?
> 
> People who aren't female or male.
> 
> Oh, I'm sorry.
> 
> I always knew my but what a wonderful word for a wonderful experience.

It is not really out of character for the BBC these days, which is largely defined by the culture of the ruling party.