I know what transhumanism is, but people who are not, for example, academics in a related field calling themselves a transhumanist makes no sense to me. Like, as a transhumanist, what do you do?
Are these people just identity-hungry fans of a genre of sci-fi? Are they saying we shouldn't work to solve societal problems because technology will do it for us? Do they just watch a lot of youtube videos about it?
The stemlords who do that often do reference Neuromancer and the Singularity as foundational, often without having read the former or worked through stuff related with it.