True but now it's impossible to tell which hotels are part of it. There's a banner that says "The Edit" but there's no way to tell when you're looking at a hotel if it is part of the program and if you get benefits. The old LHR site won't let you search for hotels either.
I'm trying to figure out if Intercontinental or another hotel in Ljubljana are in it.

Update: It turns out to be way easier and less expensive with the Amex platinum card equivalent.

Is it very common actually get room upgrades with these programs?