Well, of course it's possible for Google change any video on YouTube however they like (yours, theirs, someone else's). The news is that they're actually taking advantage of that ability to stealthily edit the details of something controversial.
Defense lawyers in countries with poor free speech rights can rejoice. "Yes, the video was uploaded under my client's account but prosecution has not process beyond a reasonable doubt that what we see today is what my client uploaded".
There are upload logs. They can be subpoenaed.
They can also be deleted.
So various governments calling up Google to stealthily edit out video content they don't agree with or might be harmful to them, doesn't concern you?
Well that's fine, but please don't pretend this is a practice other people shouldn't be concerned about.
It's something that worries me. Erasing or changing data is a lot easier than book burning. Stalin's non-people for the 21st century.
I would be more concerned about people trusting content uploaded to YouTube as something that has meaningful, long-term political value.
It's getting harder and harder to trust anything today. Downloaded files can be fabricated. So can be paper photographs. Or old newspapers.