LrC does not to the best of my knowledge, install, modify, update, or remove printer profiles. The printer profiles are not a part of the LrC code other than it knowing where they are supposed to be located on your computer.
Printer profiles are installed either by installing/updating or reinstalling printer drivers. AND by downloading and placing in the correct location printer profiles from various sources (printer mfg, paper supplier, third party)
So the question is, what is deleting the profiles, (if that is occurring)
Inquiry: Where they deleted? Or did somehow LrC not see them? Or are they not selected to be viewable?
Just another Adobe customer; My Sys; APP: LRC 10.0, PS 22.0; CMP: WIN WS 16GB OS 10 v1909 (18363), mid 2015 MBPr 15” 16GB MACOS 10.15.7; 4K EXT DSPY; CAM: Canon 5D Mk III, Fuji X-T3