I figured such, but like I said it’s pretty trivial to do a helmet. Just editing the texture layers and the reflective parameters. There basically already is an asset template in the game for the Cardinals alt helmet, for example (the 2010 Jags, change some colors, vary the glitter amount, etc).
But they still have a design/release plan and can’t go interrupting it just because the NFL suddenly drops new helmets on them, which is why the helmets being part of a patch makes sense.