I don't think there is anyone or anything on earth more suitable for selecting a partner of my specification than me.

Which is what it makes easier for you to do, it makes it easier for you to find a partner while searching, It's more like you search for a specific type of personality, characteristic, work type, body type and it scrapes the internet and looks for people that fit into those criteria and returns the twitter handles of those people to you

What if it filters out my soulmate?

Chances are if the descriptions are clear enough, there's a very low probability that would happen, and it's a search engine, if your match is not in a particular search, then search again :)

I think I get enough cold sales DMs from b2b AI hypeguys that I don’t also want randos flooding my inbox telling me GPT said I’m their twin flame or whatever.

Lol, the GPT would also generate the intro text :)

Already done, at least proof of concept:

https://gizmodo.com/guy-used-chatgpt-talk-5-000-women-tinder...