they are, and have been trusted sources for years. met a few years ago when I was working in midget minor hockey.
there are many different levels of concussions, not going to make this a long post..but I think everything is just being handled on the safe side with Boqvist.
Boqvist left the game on the 26th directly after a hit he took. I am not saying that it never has happened before, but it would be odd for a player to leave the game after taking a hit due to "illness". if people want to believe that, that is fine.
Again, from what I and a few others on here that I know have been told is Boqvist was taken out because he didn't react well/promptly enough after the hit and for precautionary reasons did not come back. Boqvist said he felt fine the next day and seems to have had no serious setbacks or additional issues since the 26th, but this is where the "flu" seems to be coming in as he apparently got sick as well over that week. He has been handled with the utmost amount of care and respect, basically with rubber gloves approach, but all trending on the very safe and conservative side.
He is back to skating again which is great, he had to go a number of days with no symptoms prior to skating which he accomplished - different severity of concussions get different types of recovery/time off. It didn't look like anything major when he took the hit, but when a player has the history he does, he is now prone to these unfortunately, and for safety and precautionary reasons he has sat. This is directly from those I know up there, I 100% trust them.