The post was about users.
Then I don't see your point at all. The vast majority of questions asked on perlmonks is from programmers
See the original post:
Cases when there are many instances of your code (i.e. when your code have users):
You are programmer. But your code has users. You cannot suggest to your users to install perl with perlbrew, because you'll lose most of them then.
What does "supported" mean in that context? I guess there will be security updates, right
That means there is live, still supported distro with that version of perl, and yes, with security updates for perl and other software.