The person did not work "in close proximity to the border" but offsite and apparently not close enough to even be covered by mandatory testing. She wouldn't have had even her *first* dose at the likely time of infection even if we'd had vaccines a month ago. And also ... https://twitter.com/dbseymour/status/1361163931713118212

We still don't have enough data to be sure that a completed course of vaccination (for the Pfizer, 2x doses, 3 weeks apart) prevents asymptomatic transmission. Seymour offers no evidence for his claim that we (and Australia) "stood back" and passed up a chance to get vaccines.

Seymour at this point is just throwing shit at the wall. I don't think he actually believes everything he says, but he's calculating that his potential voters will.