I expect your gloves will not hold 90 PSI either
The warning is specifically about PVC & compressed air systems. I suppose a mfr could find a formulation, test it, test, certify it. But then it would not be the commonly available PVC that the warning applies to. The warning also allows covering the PVC with a shatter proof material covering it. That would be an engineered solution I suppose.
BTW I have several applications that I don't use "steel" for as well.
