It seems like TwixtBot's 13.j18 was a signal that it was not worried at all about 12.h8. It was worried about the bottom corner. So, what if |12.i19? Could TwixtBot still poke through that? If not, that would have forced TwixtBot to mount a threat up the right side of the board. It's hard to say what would have happened then.
It might be, but after |10.g2011.h17 white is threatening to play G19, so black has to defend against that threat. For example 12.i1913.r16 and in my opinion white has the advantage. White threatens J18 or P11 and I don't see how black can defend against both. It's complicated and I could easily have missed something.
or 14.m19 15.o18 16.n17 17.n16 18.m15 19.m14 20.l13 21.l12 22.k11 23.m10
or 16.p20 17.l21 18.k18 19.q17
or 16.l17 17.o14 It all looks crushing for white.
For example 12.i19 13.r16 and in my opinion white has the advantage. White threatens J18 or P11 and I don't see how black can defend against both. It's complicated and I could easily have missed something.