As u/EvenBiggerD noted, it’s the 309A

EV 309A. It's the only shock mount I've ever seen used with RE20/RE320/RE27.

Alright, I think I understood that, thanks! I suppose I'm just surprised a microphone would be recommended if it's so "cold" as to necessitate a device like a Cloudlifter to produce good sound. I'd have thought there are other dynamic mics for a marginal price bump that would handle it all, thus pricing such "cold" mics out of the market. Out of curiosity, if I were to go with a dynamic mic, what would you recommend (with/without cloudlifter) for game streaming? And would it work with the boom arm + shock mount we discussed (in OP).

A lot of the mics that require some Cloudlifter assistance gained their reputation from places like radio broadcast booths and music recording studios. There are definitely better mics, but you also run into the law of diminishing returns, where you start spending 500% more money for like, 5% or less performance gain. These mics still produce the same quality of recording, but are at a much sweeter price-to-performance point, even factoring in the cost of the Cloudlifter.

As for the dynamic setup...well, let's see. You'll need a mixer/interface board, I'd recommend the Alessis Multimix (~100$) or the Yamaha AG06 (~200$), both are solid starting mixer boards that do most of the functions you'd want. A Cloudlifter CL1 will run you ~150$, a Fethead ~100$, I've tried both and can't tell a difference in signal/sound quality, the only difference is in the build, the Cloudlifter is much beefier and would probably stand up to more moving around, but in a stationary setup that's not being taken down and moved around a lot, I'd say save the $50 and go with the Fethead if it's needed. Mics would really depend on your budget. In a more budget-friendly category would be the Rode Procaster (~220$), which sounds really good and can hang with some much more expensive mics, and will work with both the shock mount and arm. If you want to step up in price to around the 400$ mark, you're looking at stuff like the Shure SM7B and Electro-Voice RE20. Both are ridiculously good mics, though one thing to note about the RE20 is that Electro-Voice does some kind of electronic witchcraft in the mic to normalize out the proximity effect. That can be a good thing if you don't like/want the proximity effect, but if you do want to use it you won't have the option with that mic. Another option in the ~400$ range would be the Rode Broadcaster mic. The sound is similar to that of a Procaster, and (to my ears at least) sounds better than the SM7B or the RE20. Plus it doesn't require a Cloudlifter/Fethead, just phantom power from your mixer board, so the overall setup is cheaper. All of these would work with the boom arm...the shock mount, not so much for all of them. The Broadcaster can work with the shock mount with a small modification; the SM7B doesn't work with any shock mount, its mount is built in; and the RE20 will not anchor into the PSM1 correctly (I don't think it will at least), but EV sells their own shock mount for their mics.

Last question: I'm leaning towards the USB condenser mic still. In your opinion, if I went with that mic, sitting off to the side at a decent distance, with a sound dampened room, but only moderately sound proofed room (per window concern), using an open-back headphone (low to low-medium volume), and running a VST with de-noise (to address A/C potential), for real-time game streaming purposes (so not dealing with recordings and post-processing and audience is mostly not audiophiles), do you think this would be a bad idea?

I think that it sounds like what a lot of streamers use without any real issues, so I'd say you'd most likely be fine with that sort of setup.