He's pretty easy as long as you don't try any fancy moves with the Shade Cloak and know the bees he spawns are invincible.
He fights similar to Hornet.
The Traitor Lord in Queen's Garden has also been upgraded. He is bigger, has more attack patterns, more HP, and is now one of the few bosses that deal 2 points of damage per hit. He turned into a serious threat. I was down to 2 HP near the end.
The fight against Hollow Knight is trivial. I stacked up 5 blue masks before I went in and tried to keep as many of them as I could for the true final boss.