Not "almost", it is a completely new language with a passing ressemblance and IIRC was by and large advertised as such from the get go; the name "Perl" was kept as it was a spiritual successor, which they realised made it confusing so they changed it to Raku.
Perl 5 and 6/Raku have as much in common than Perl 5 and Ruby have.
Perl 5 and 6/Raku have as much in common than Perl 5 and Ruby have.