You have no clue if he got 2 concussions though. It was 2 hits, that doesn't mean there was 2 concussions. He could have broken his vertebrae on the Steckel hit and gotten a concussion on the Hedman hit for all we know.
True, though neither do you and you've held hard to calling this his second. It doesn't really matter as he's seemingly recovered from that time period. Regardless, counting two incidents as one because they happened within days doesn't make any sense.