As stated in the pop-up message:
"You can still use these transactions in Release 6.xx. However you should change your process over to transaction MIGO".
So,
1. MB** can still be used. It's not recommended but you can keep your process unchanged if there is no error/problem.
2. If you want to change, you should change to MIGO, which is the new-centralized-transaction for MM-IM posting.
This is why you are wrong. VL01, VL10* is totally irrelevant here.