Is getting a rec from a person like this acceptable?

lookingforward
Sun, 29 Oct 2017 03:51:30 +0000

Read what Chicago says about who should write an LoR.
If you have that covered (it’s not clear if this is a primary letter or extra,) you can add a rec, but try to understand what value his letter would actually bring, vis a vis what Chicago looks for. See how Chicago words it in that link.

Make your best decision, but maybe talk with him, see if he knows what to write, what’s usually covered.