It was a perfect example of why it is a bull**** rule.
First off, Laguda led with his shoulder, not his head. His shoulder hit the receiver's chest first, and while there was helmet to helmet contact, it was secondary.
Second, the hit was not excessively late, nor did he leave his feet to launch himself into the receiver. It was not worthy of a 15 yard penalty in any case. But, it did look like a big hit, and refs, I believe, are conditioned to throw the flag at any big hit anymore.
Third, the fact that the onus is on the replay ref to find convincing proof that it wasn't targeting. Now, for us homers, it's easy, but for an unbiased observer, I could imagine that it was close. So they went with the call on the field, which is, imo, the wrong decision.
The fact that it's replayed is a good idea, but because the result of the rule is an ejection, there needs to be indisputable proof of targeting for the player to be ejected. It should be easy enough to see true targeting. If it's borderline, the player should remain in the game.