He contacted the receiver with his helmet?
live, field level, I'm sure it looked like there was illegal contact to the calling official - it's only us in the catbird seats with our TV angle, slo-mo, etc., etc. who get excited because we now see little or no contact.
Yes, you have to have contact for this PF - that's fundamental - but would anyone stake their career that there was no contact if you were to have been there seeing it live?
So the hand was in the cookie jar, maybe it didn't come out with a cookie .... but Mom still caught little Johnny in the act!
This should be supported all the way!