I'm not sure why these players set up tables that you can join, if they don't want to play with this elo level. Are you sure it's about elo and not about, let's say, that they wanted to play with friends (which for some reason they didn't invite?). Or maybe they are the new account but not the new player, and as experienced over what their elo shows, they prefer to play with also more experienced guys? Hanabi as a fully coop game with a lot of gamestyle changes due to experience is enjoyable mostly in a similar level players team.
Don't we all start our ELO from 0 in Hanabi?
Well, I started with 700, if I remember correctly... *that's just a joke about a previous elo system*
As I said above - there are some players that created new accounts for various reason, and while they might have low elo, they aren't really at the same level as a "true beginner of BGA Hanabi". Usually it doesn't matter if these beginners knew the game rules from real life. If they haven't been playing in BGA way or with people that learned BGA style, they aren't going to play well with the higher rank BGA players.
You may look for some groups of "friendly players" or maybe there is a Hanabi teaching group. Maybe this will help.