What are reasonable expectations for LVP floor installation?
All floating floors are inevitably going to move a little when walked on, however any remaining thinset or glue residue or sheetrock mud clumps etc. should be scraped/ removed to an acceptable standard ( Coretec requires no "hump" exceeding 3/16" in a 10 foot radius)  failure to do so will result in excessive movement of the floor in the soft areas surrounding the hump.