COVID-19 isn’t the same as a positive SARS-CoV—2 test. This is what they measured, from the caption of table 10 in the pfizer fact sheet you linked:

> Note: Confirmed cases were determined by Reverse Transcription-Polymerase Chain Reaction (RT-PCR) and at least 1 symptom consistent with COVID-19 (symptoms included: fever; new or increased cough; new or increased shortness of breath; chills; new or increased muscle pain; new loss of taste or smell; sore throat; diarrhea; vomiting)

That’s kind of squishy, but I think it’s a clear distinction.

I agree that the effectiveness against symptomatic Covid is lower with omicron, but omicron also evades immunity from prior infection as well.