This is a huge disappointment.
This idea is just a cheap meme, based off the name "Spartan" being assigned to the playable characters. This is bottom-of-the-barrel stuff right here, and it doesn't even look good.
I would've been fine with a helmet (and armor set) that hints at the ancient Spartan aesthetic, but this trash goes way too far. What does Halo even have to do with Knights, Nords, Liches, or plague doctors?
I know there is a toggle (and I'm going to use it), which actually means that this update is even worse, because now this update is going to effectively remove all the other new stuff that was worth having visible, like the 4 ODST sets.
343i is already starting this pattern (Samurai armor core) in Halo Infinite, under their non-cannon "fracture event" label. I pray to Joseph that they add a toggle for that brand of garbage in Halo Infinite.