I just re-watched the episode. I don't often do that (I used to*) but there was a lot going on and I think I was in shock about Dr. Culber and missed lots.
Okay, so Lorca couldn't know about the USS Defiant visit to the MU unless he was MU. It hasn't happened yet in our prime universe.
Now that I know that, I can clearly see Lorca lying, a lot, but he could be telling the truth when he said that he and Stamets had considered jumping to other universes. So, Stamets is a possible MU too.
Burnham wanted to check out the spore drive jump logs, but Lorca put her off. He wouldn't need to do that is she was MU too. Also, you only need to look at her reaction to killing the Shenzou Captain in the turbolift to see she is not MU.
So, Burnham - not MU.
Lorca is MU.
Stamets - possibly, but in his condition, who can tell?
Dr. Culber is a definite no.
Tilly - not sure, but extremely unlikely.
Tyler - No, but then he isn't human either.
We really don't know enough about the rest of the crew to decide. The Bridge officers are just faces and voices.
Next, the Tyler thing:
Klingon medicine and science must have advanced a huge amount between Enterprise and Discovery and I'm not sure how.
Klingons don't have the battlefield medicine and surgery that has driven human medicine and surgery. They let their injured die. They certainly don't do reconstructive surgery. In the Enterprise "Augment" episodes the Klingons had no experience of genetics and gene therapy. The technology and medical techniques required to create "Tyler" are way beyond those humans have, so how can Klingons have them?
Something is clearly wrong with the process though, whatever it involved. Tyler was meant to "flip" during his encounter with L'Rell but he still only has subconscious knowledge.
The final thing that I missed is that there is an ISS Discovery that has taken the place of the USS Discovery in our prime universe. Now, that is something that records would record. I doubt that even "need to know basis" could cover up the effects of a Terran Empire ship let loose in our universe, so I look forward to how they resolve that.
*I used to be a card carrying member of the Star Trek nitpickers club. I apologise if this seems a little like that.