That's an opinion, one that is wrong imo.
Galchenyuk hasn't been playing that great. Has been pretty invisible in a number of recent games, hasn't scored in last 14. I think that has more to do with it, plus, he already played twice versus the Bruins.
I think me and ELB are saying the same thing as you, i.e.:
benching Chucky to shield him from big bad bruins sends a wrong message
benching Chucky cuz MT wants to incentivize him à la Eller is a totally different thing and deserves a legitimate debate (I can see how some want him in the pressbox for his play, although I disagree).
I guess that the only source we've heard citing it as being the first case was Momesso, so you're likely right in that it's a wrong "opinion" if you meant that the interpretation of the reason for his benching is wrong.