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OP here: Yep, it's Discord. This all happened on a Discord server for a tech youtuber, I'm not sure if they want to be "outed" but they're an 800K subscriber-ish youtube channel with a five-ish thousand member private discord. There were a bunch of people involved, but you might see Arae around in the Reddit thread, she was the one with the actual 9700X in question. None of us have met IRL and we do stay fairly anonymous, but we do chat quite regularly (I've known Arae in particular for at least six months now).

If you're looking for similar discords, I might recommend the discords for things like Bazzite, LTT, Mint, or any number of other small-tech-youtube-discords, or discords for technical video games (eg. Turing Complete, BeamNG, PCBS, Factorio). Discord has no algorithm, you have to find the content yourself!