Function names aren't wholly distinct from comments. They suffer from the same problems as comments - they can go stale and no longer reflect the code they're naming.
I think the argument against comments is that while function names are a necessary form of communicating intent of the code, comments aren’t. The more forms there are the more work there is to update on each change in the code. Comments mean more to update and hence more to fail to update. They also generally can’t be detected for staleness as well as functions, although that is changing now with better ai, not only compilers etc.
