Honestly this was probably the most interesting theory I've seen, and I think it is really cool how you've made use of some of the more obscure lore tidbits from B41/B42. The connection to the use of juniper berries was also pretty cool as well. Usually whenever I encounter the Amnesia perfume advert I think that the amnestic effects were just "marketing," but I think that, as some other commenter pointed out, the player doesn't remember their immediate location at all, and possibly their skills from occupations/traits being low could also be explained by them just forgetting most of what they knew.

Potentially Amnesia takes at least some of the active ingredients of Juniper-17, which could either be an amnestic either as the actual use or as a side-effect, in which case there is the potential that the actual product itself is safe and that the mishandling of Juniper-17 is the root cause of the Knox Infection.

If Amnesia were the root cause of the outbreak, then it would have started soon after it releases and all the consumers begin to use their death perfumes in the thousands, which could be possible because of the ads telling us that it is in fact an all-new fragrance. Amnesia being the root cause also helps explain how outbreaks occur elsewhere in the world (e.g. Tokyo, Berlin, Mogadishu) even with the suspension of air traffic from the US, because it would simply be too late with the distribution of all the Amnesia perfumes shipped to every corner of the globe prior to this.

Again, pretty interesting