I agree that situations like that occur postflop, but I do not think that they should ever occur preflop in a GTO strategy, especially after Snowie VPIPs.
For example, maybe it's the case that in NLHE 100bb deep, the button is entitled to an automatic profit on his steals (although I doubt it, I don't think it can be ruled out), but I can't see that ever being the case in the scenario provided by andyg. I think it is just a clear flaw in Snowie's strategy if what andy says is true, and obviously can't be GTO.
Just my 2 cents. I am a beginner when it comes to GT, so there's a good chance I'm wrong.