Removing those types of files from FTX goes with ANY of the FTX regions. If you have LAX, LAS, SFO, SEA or ANY addon airports that reside within FTX regions.
That file, FTX_PNW_objects_CYVR_Delta_PLC.bgl afaik can stay in FTX PNW. Im not exactly sure what it does, but doesn't seem to interfere with FSDT CYVR.