I don't believe Samuel Delany is an open NAMBLA member. He has expressed support for NAMBLA in 2004, and in 2014 admitted to reading a newsletter from them but

I don't believe Samuel Delany is an open NAMBLA member. He has expressed support for NAMBLA in 2004, and in 2014 admitted to reading a newsletter from them but claims not to have kept up with them for 20 years. These statements are now a decade and two decades old & I don't know what to make of him now these days. If you have more recent info, please let me know. [Also: alleged pedophile? who alleged him of pedophilia? seriously asking]