Doesn't matter. It's still merch that can be linked to something. The other houses have their own merch, and as I said, the Mohawk skull is still present on the "preview IP" shirts.I mean one character from a "movie" that will be in a house with several other "movies" isn't really a theme for the entire event. No other house has had that vibe.
Not everything has to be related. Besides, that's like saying last year's "see you in the fog" shirts didn't match the event. Haunt events use fog. The monsters see you in said fog.
Just enjoy variety. They could just go back to bare minimum merch like the old days.