DY: “If it’s assur to be m’vatel milk into bread…”
Only bread likely to be eaten with meat.
“it would have the status of not batel”
Not true. The Issur b’DiEved on one who was MEvatel Issur is ony a Knas.
Have you ever learned YD 87? Mixing fleishig rennet with milk itself is not an issue of Ma’amid if the meat is intrinsically Muttar. Bread intended to eat with meat cannot be worse than the meat tself!!!
“Then why your comment to yitayningwut?”
The Shulchan Aruch and Rema in YD 134:13 DO Pasken the Rashba. This should be sufficient to give one pause before relying on the supposed absence of problematic ingredients on the label even if the Nodah b’Yehuda and others do not.