I have IHC with the blocker dipping his head as he leads into the man. Saw it at full speed, slo-mo makes it more clear, and I can even freeze the video at the point of impact to show where the side of the helmet is led into the trailing man's helmet. Like others, I'm surprised there's a debate on this. No BIB, but clear IHC.
People, if you can't see this is helmet-to-helmet, then pull the rule out of the NFHS rulebook, because none of you are going to call it anyway.