Dear Cleeds,
Positive, Neutral, Negative VTA are popular expressions which have been around for a while.
Put simply, it’s easier to type "Negative VTA" rather than "I arranged the tonearm so that the pivot was lower than the stylus" or a similar verbal "fudge".
You can call it "physically impossible" if you wish. Whatever floats your boat and makes you feel good.
;^)
Regards,