No, it’s the same language but with different semantics around a specific type. That’s not a different language and code can co-exist with a bit of thought.
Every language goes through this at some point in its development: flaws that limit future development have to be fixed. Should every language rename itself and split its community at that point? That seems like an extreme response to a common problem.
Yes, yes it is. And, like "Perl 6" and to a lesser extent "C++", that name is misleading (and therefore bad), because there is already a different language called "Python" (respectively "Perl", "C"), with significant superficial similarities that it could be confused with.
