The ASIN currently flagged don't show up on any searches, and so you technically can't (or shouldn't be able to) add new inventory on those and send them in.
I added some items to inventory, after the Apr 4 message, that turned out to be flagged and disappeared on May 5. I received zero emails about those ASIN being out of compliance.
If the item shows up on a search, and your are able to add it to inventory, you will probably be OK. IFAIK, if it's later flagged, you should have 30 days to recall it.
If you stick with FBM, the only issue will be the listing goes dark. HTH.
p.s. as a safety, you could take pics of the (1) UPC and (2) address portions of the box, including the item number and set number when possible. Then, if they are flagged, you will have them to send in with the CPC cert that you can download from Lego. All bases covered in that instance.