Stable: F19 is still wrong, but I think the correct response is G19
TwT: Thank you, Stable, for sharing your thoughts. You're correct that F1 is incorrect, and G1 is indeed the better response. Do you miss a more effective sequence that could serve as a refutation?
I think it is a tough call, because sente seki sequence isn't ideal in terms of points. I would say that we keep both as alternatives.