True Analog LPs versus Digital Recordings

That's exactly what I was going to say!

I suspect that almost everything today is recorded digital. My friend works for very large recording studio where they got rid of expensive analog tape recorders more than 10 years ago. Analog tapes require constant maintenance because of layer to layer copying. They had to rewind all tapes at least once a year. With tens of thousands of tapes it required whole department to do it. I cannot tell (other than tape hiss) if recording was originally digital or analog but my ears are perhaps less than perfect.

CD players have provision for de-emphasis of analog recordings - function almost never used since not needed with digital recordings (no tape hiss).

Unless the recording is specifically labeled as all analog you should assume at least one digital stage in production.

I don't know how you'd find that out without contacting the label and inquiring in-depth. Tacet has a few all-analog recordings. I own all of theirs.

Older recordings pre-dating the early 80's are almost certainly pure analog.

Otherwise, you will find more and more digital in later years. Today I would suspect most everything is digital unless analog processing is clearly identified otherwise.

I the early 80's, digital was novel and recordings advertised that as a selling point.

Today, digital is the norm and analog novel so I would expect those using analog gear would want to make it clearly known to buyers who are looking for that.