I suppose, the parent comment was referring the Three Virtues of a great programmer: https://thethreevirtues.com/
Bad communication isn't one of those (although, given the prevalence of bad communication in the industry, one might assume it is ...).
I don't think it was so much hubris as bad communication.
Perl 6 was understood to be that: Perl 6, a definite successor to Perl 5. But besides being very, very late it turned out not to truly be Perl 6, but a new, incompatible, Perl-ish language.
I think the decision to rename it to Raku was a good one, but came too late. By then the world had already moved on.
Done early enough I think it'd have fixed things. It'd have created the clarity needed to understand that Perl 5 wasn't going away, and that it was pointless to wait for a successor.