edit: i read the reddit thread and i see that you are talking about the puzzle
in the op and not the comment thread that you linked. in other words, the puzzle is this one
..9...2...8.5...1.7.......6..6.9.....5.8..3..4....7........4..9.3..1..8....2..5..
and not this one, which is the one you gave a direct link to
8..........36......7..9.2...5...7.......457.....1...3...1....68..85...1..9....4..
i take it from your new account on reddit that you are /u/newman-iknewit? as a correction in your reply to the reddit post, the other puzzle they're talking about isn't arto inkala's ai escargot (2006) but a different puzzle that he had published in 2012 long after se 11.9's had been discovered. his new puzzle is se 10.7 but starts with a multi fish and it reduces to 9.0. for the benefit of those reading this thread who may come from reddit, the arto inkala puzzle has been beaten to death several times before
here and
here and
here and by me
here and
here, which i will let those on reddit know about in a bit when i wake up
edit 2: since the op didn't provide the original puzzle they started from that hodoku rates 27792, and hodoku ratings aren't invariant under isomorphism, there is some chance the op started from the same puzzle and just came up with an isomorph of it by accident, especially if they only did a vicinity search or something