I think Sander is a chaser, but there is a mismatch between troons he is attracted to, and troons who will let him fuck. He wants a troon who can stealth pass, but the stealth passers want nothing to do with him. Stealth passers don't want anyone to know that they're trans, but the first thing Sander will do is tell everyone that they're trans!
It doesn't help that stealth passers are rare, while hons are a dime a dozen. The desperation and lack of confidence make it even worse. I consider him to be a straight chaser, which is distinct from a gay chaser. Gay chasers have a much easier time because hons are not a dealbreaker at all. It's why Sander chickened out with Peppermint, because Peppermint saw him as a gay man. Of course many troons claim to be super offended by chasers, but when it comes down to it, they will hook up with them because the good ol fashioned cis straight men sure as hell aren't interested, and they don't want to die alone. Wealthy chasers can be their ticket to passing, because they'll pay for electrolysis, boob jobs, and facial surgery.
Sander is attracted to the concept of an MTF, but there are very few who meet his criteria in reality. He's as hopeless as a transbian who is taking the Chris Chan strategy of trying to get with real lesbians by becoming a lesbian.