I can't speak to the evidence or lack thereof, but this is what they were referring to:

https://en.wikipedia.org/wiki/Twitter_Files

IIRC, Twitter(and several other social media platforms) was asked to limit/block accounts that were spreading Covid misinformation at the height of the pandemic. You know, the kind of stuff a functioning government interested in protecting ALL of it's citizens would do. That's "heart" of this "government meddling" excuse.

I would say there is all sorts of "government meddling" going on right now, with all the uncertanty and mess with all the services + departments we all rely on over the last month....

A government might want to do it for good motives, but its still a restriction on free speech.

Otherwise you are appointing some group of people to decide what is "good speech" and "bad speech" and banning the latter.