Yea, no shit the Oilers are interested in Binnington, they should be interested in any competent starting goalie.
The Blues would be stupid to move Binnington. I love Hofer, and think he's gunna be a starter in this league for a long time. But when you've got one of the hottest teams in the league, you aren't trading you cup & gold medal winning starter to hand the keys over to a relatively unproven kid. If I'm the Blues I'm looking at this group that's absolutely buzzing right now, with a goalie who has has swagger back coming off a 4N win, and a potential first round matchup with the Jets? I'm all over that, I'd be looking to add a piece or two. Thats about as winnable of a 1st rd matchup as you could ask for as an 8 seed.
Meanwhile the Oilers should be pushing what little chips they have left in on Gibson. Realistically they won't do that, and probably settle for someone like Brossoit from Chicago.