First and foremost, where is that code from?

It's from a youtube video titled "Raku: The Programming Language You Didn't Know You Needed" by someone named Curtis Poe. The description says:

This is an update of my Perl 6 for Mere Mortals talk. There's not much new, but it refers to Raku instead of Perl 6 and some slides have been cleaned up. This was presented for the 2021 FOSDEM conference.

Link to Video