A "physical property", in this context, may be a metaphysical or logical combination of properties which are not physical in the ordinary sense.
lol
I've been watching as ontology has gone sideways since the new generation of blinkered STEMites decided they were qualified to weigh in on it, but this goes even beyond what I cynically expected.
Remember when the term "Orwellian" was often treated as somewhat ridiculous, because western governments, censorious and propagandistic as they might be, still didn't rise to anything close to that extreme a level?