It looks like the -AllowDebugger switch prevents Premium/Deluxe aircraft from loading. I just spent many hours tracking this down when my WB Cessna 172 wouldn’t load. I’d forgotten that I’d added the switch to the FSUIPC bat file that I use to launch the sim (for convenience when I was doing some dev work). Once I thought to remove the switch, all of my missing aircraft returned to the carousel. If this behavior is by design, it would be nice if the SDK documentation for this switch was updated accordingly. I’m posting here in the MSFS forums in case anybody else gets bit by this down the road.
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It is actually documented in the SDK .
… but note that some content will be “hidden” (ie: encrypted packages).