I don't play with solvers, but I understand the general basics of GTO. I don't think there is anything GTO-style going on here though.
The problem with the strategy of playing 64s as a limp UTG is that you are inviting the world to come along and not considering the concept of reverse implied odds....which means, when you hit your monster and are not good because somebody else hit the bigger monster. This hand is a perfect example of that because you catch your flush, but the button caught the nuts. Also, say we flop trips...we have to be good, right? Unless button limped behind with A6 and we are out kicked. Nah, this hand out of position is an EASY fold.