Yeah, that's clearly a blatant mis-matched claim by Purolator. The BOSS is actually >46u per Spec Sheet.I'd like to trust Purolator but I can't. Its good you can request a spec sheet on a filter but what does it say about a company that on all their point of sale packaging and website they claim "based on ISO 4548-12 at 20 microns on PL30001" but if one requests a spec sheet they're usually higher, not lower. The Boss is advertised at 25 microns but their spec sheets have it over 40.
Purolator's claim on the Purolator ONE:
https://www.purolatornow.com/en/products/oil-filters/purolator-one.html
PL30001 (ONE) Spec Sheet shows 99% @ 25u (close, but doesn't match website claim).
Purolator's claim on the Purolator BOSS:
https://www.purolatornow.com/en/products/oil-filters/purolator-boss.html
PLB30001 (BOSS) Spec Sheet shows 99% @ >46u.