This is a sensible step forward for both languages.
The moderators of r/perl have had a discussion and we've agreed that going forward, this subreddit will be for the discussion of Perl 5 (and, I guess, earlier versions). Posts about Raku are off-topic here. I think that's what most readers here wanted and I think the Raku people will welcome the separation too.
See all the discussion at https://www.reddit.com/r/perl/comments/dmtxk1/raku_posts_in_rperl/