Need to slow down and get some expert input on this one. It isn't going to make all those foods and supplements disallowed. At least not yet. Most of these items I've never heard being used as bulk fillers.

This is guidance for "compounded" drugs... in other words, what can be used with a drug that is custom-made to get it into a form such as a capsule or eyedrops. My dog was on cyclosporin, which the pharmacists had to custom blend with a corn oil base to make eyedrops. Compounds are also made for people with allergies who can't take the normal stock med. The active ingredient gets mixed with a bulk good as a base.

Here's the official guidance document on compounding...
https://www.fda.gov/media/121315/download

and here's the notification of reclassification evaluations.

https://www.fda.gov/regulatory-information/search-fda-guidance-documents/evaluation-bulk-drug-substances-nominated-use-compounding-under-section-503b-federal-food-drug-and

I would say concern is warranted. It has gotten to the point where the motivation and actions of alphabet agencies are more often sinister than innocuous or pure.