I'm not going to comment on the suspensions and who deserved what, but from that video I have to agree with the person who said the linesman fell on his own. It wasn't right for Huberdeau to be jostling with him, trying to get away from him, and it probably led to the linesman slipping but in the video imo you can clearly see the linesman feet come out from in under him, at which point he grabs onto Huberdeau tighter to try and stop himself from falling which leads to him pulling Huberdeau down with him.
Yes Huberdeau was in the wrong, and he played a part in injuring the linesman and he should be suspended for that, but it's not as bad as it looks, it wasn't intentional.
I haven't seen the Noesen hit, so I can't comment on it.
I do agree however that the IIHF should take their own look at the plays, and not just base things on the length of suspension in whatever league the player is in.