Didn't really change the cancer that is pyro at all.
Degreaser received more damage than before thanks to the removal of the 10% penalty + reduction of damage falloff on all flamethrowers. The switch speed was 250ms before, now it's 350ms switch away, 200ms switch to, 100ms difference. You are stunlocked until you hit the ground so it still doesn't matter. Afterburn reduction of 4hps to 2hps is welcome but still doesn't solve the main issues.
https://www.youtube.com/watch?v=6KvFLEZrQV4
Large cone for flames which doesn't even pretend to encourage aim. Even larger cone for airblasting players which stunlock allowing for effortless shots with a secondary. And finally a massive bounding box which projectiles can be reflected from.
https://youtu.be/6KvFLEZrQV4?t=10m
Pyro nerfed? Not really. Team focus fire and zoning the pyro counters some of the cancer, but it doesn't make it any less cancerous.