ProgrammingCircleJerk

I would consider the tasks you’ve mentioned to just be part of your day-to-day work

I mean, that's the joke... just like doing code reviews is literally part of your everyday work. The joke is that the first few things are things that are very divisive and then they get increasingly more ridiculous including individual accountability and code ownership. In regards to the rest of your post, I don't think I've ever heard that called "individual accountability". Individual accountability is exactly what it says in the dictionary:

the fact of being responsible for what you do and able to give a satisfactory reason for it, or the degree to which this happens:

There were furious demands for greater police accountability.

Accountability is important these days, and managers aren't always willing to adopt risky strategies.

a situation in which someone is responsible for things that happen and can give a satisfactory reason for them:

The organization suffers from a lack of accountability.

greater/increased/more accountability The public has been demanding greater accountability from lawmakers.

If the people around you are using accountability in the way you described, then they're just morons who make up shit.