They straight up had state sponsored gay bars and there was a massive state sponsored education campaign on lgbt people. During reunification they also lost massive economic gains, along the same line as what "why women had better sex under socialism" talks about.

Economics issues and social issues can't be isolated. Homeless queer youth are affected by economic policies.

The only communist country that allows it now is Cuba. They legalized it almost one year ago!

Tbf marriage isn't as much of a priority given what rights marriage grants in Cuba. Cuba has been doing SRS for free since 2009 and has sponsored massive education and anti-bigotry campaigns. Gay marriage is important but not that important compared to a bunch of other issues.