... the files on my drive were 32 bit (!)96kHz wav and I don't recall converting them at all before prepping this post...
...
Aha! I was considering this to be a (remote) possibility, but decided not to discuss it as the comment was long enough already. It would have been better to discuss it. Good to know that you're aware of the problem and didn't upscale.
So, you have it in 32-bit format, interesting!
As FLAC and most other codecs can only accomodate bit depths up to 24, you actually had to do the conversion if you didn't want to post it as PCM data and in a WAV or WavPack container.
I am fairly sure that the files from the OP in this thread were 16-44, because that's how I have them. I do downscaling from time to time, but I would have downscaled 32-bit, 96-kHz files only to 24 bits and 48 kHz at most, not further (that's because I would wish to keep it being obvious that it isn't a CD rip).
The 32-bit files may well be the original rip. Some rippers use 32 bits since it may make edits more exact. For listeners, this many bits are utterly inconsequential.
It should be noted that also in the 32-bit, 96-kHz files there are no frequencies above 21 kHz present. Which means that the red-book CD format is sufficient to capture the complete information contained in those files. The bit depth only affects the noise floor and plays no role for a vinyl recording, as long as it's at least 16. That's because the noise floor of a vinyl recording is already way higher than that of a CD, and its dynamic range is smaller.
Or maybe what you have is an official web re-release -- or something closely related -- by the current rights holder?