It seems to me that the TLM passes far less germs.
I was thinking about this at my Novus Ordo Mass this Sunday. All that handshaking and the communion in the hand, it has to be a flu outbreak waiting to happen.
The dirtiest part of the body is not the tongue but the hand, and putting the host into your mouth with your hand - after the eucharistic minister has also touched it, probably after touching many other hands - certainly couldn’t be any “cleaner” than the risk of an occasional tongue touch. The latter happens, but not very often.
If the bishop had really been concerned about that, he would have prohibited communion from the cup...but I notice that he didn’t seem to consider that (everybody’s saliva all over the cup) even remotely risky. So I’d say he’s doing this just to harass the people who go to the TLM.