That post linked above isn't Word of God that Crowely is agender or genderqueer. It's word of god that Crowley has "pure, unfiltered non-binary/gender-fluid energy in general". Crowley and Aziraphale are both men. Crowley dressed up as woman and his behavior is gender nonconforming to the traditional masculine stereotype, but the character is not genderqueer. As noted in that post, there was one character who had used they pronouns, and it wasn't Crowley.