So Venom is probably worse than ever against Pyro.
1v1 ends in a draw as the Venom kills the Pyro but burns to death.
Since Pyros aren't that likely to be completely stunlocked, they can easily jump out of engagements saving low HP Pyros or just spreading them out, all while the Venoms are slowly burning to death.
It was a big mistake to try and rely on Venoms in this game.

Nah, Venom is a shit unit against Pyros. I shouldn't make. Flea harassment and Redbacks is the way to go.