Nice video, I really like the way you explained the patch. One mention, the Omega Attack Speed Buff from Blazenite was always applied on him. The Empath based synergy change is purely for synergies.
I think the biggest nerf to Phosphorus is the bloom HP regen nerf. With 3 Blooms, Phosphorus can usually consistently get 2-3K hp healing (which is like 100% of its HP). I'm sure Phosphorus will be much weaker now in terms of tanking.
Hmm extremely hard to say but I think wildfire, invokers and any colossus build. Maybe even the magma scoriox. I think the changes are so big it’s hard to tell. For example even if something better maybe frost vanguard just counters it too much