Incels are regarded as right wing.
Black pill nihilism is regarded as largely right wing.
But transcels are a sub set of incels, but it's hard to argue they are rightwing for obvious reasons.
A transcels who swallowed black pill nihilism would look a lot like Tyler Robinson in theory.
One of the problems here is transcelism isn't being recognised in the way it should be. We see it every day on MN. Not terrorism level but certainly manifesting in a problematic way. It's widespread.
Tyler Robinson loves memes. This is meme culture and the world of 4chan so we know he's likely to have come across black pill nihilism.
4chan culture takes the piss out of everything and it aims to push boundaries and shock and then deny it as some kind of plausible deniably as a 'joke'. So posing as a right wing meme doesn't necessarily mean he's right wing. You need to know the context and his target audience or whether he was taking the piss out of someone. It's deliberately difficult for outsiders to comprehend.
Arguably someone who has come from a strong gun culture where the idea of self defence against tyranny is a prime candidate to look upon the establish as tyranny and to decide it's legitimate to take up arms in a way that someone from the UK wouldn't.
I think our desperate need to box him into left and right neatly is very much part of the problem here.
For me it's highly likely he has influences from across the political spectrum.