Ok nothing really to do with PG but all hypoallergenic and things labeled like that in the cosmetic industry there are no guild lines so all it means is that the manufacture thinks it will irritate people less. So basically it does not mean anything. If you know something is an irritant to you read the ingredient label to avoid it. All cosmetics have to list the ingredients. (same thing goes for sensitive skin stuff as for the hypoallergenic stuff...)
Working in the cosmetic industry, I totally agree with this! Knowing some, if not most of the ingredients on labels can be really helpful. e.g. lanolin and/or lavender are often in moisturizers, but most people may not realize they are skin irritants. (Personally lanolin really wreaks havoc on my skin, so I stay away from it).
Back on topic, I don't really think I'm allergic to PG in relation to vaping. I do get a sore throat if I don't drink enough fluids, but that seems to be it thankfully.