In the '90s Electrolux Corp. experimented with different sales lines besides its door-to-door one. Going by memory, they were premium store, catalog, QVC, and fair/trade show. I'm guessing that the Xtreme and Xtreme Plus were sold through one of the indirect lines as household cleaners.
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Just skimmed the XP manual and didn't see the word 'commercial' used at all. Interestingly, though, the illustrations showed a 3-prong plug, and the warranty for the motors and belt was 2 years--which was standard for commercial cleaners (standard household ones were typically covered for 5 years since the Super J. I know more recent ones such as the Lux Guardian Ultra & Lux Guardian Platinum were longer still.