My understanding of this is the following:

• This was isolated to one community in NB, a few dozen (40-60 ish people, could be off there a bit)
• These were originally covered up by the NB or Canadian government, it was eventually leaked from within
• The COVID-19 "vaccines" have been theorized to cause prion diseases of some sorts, due to the spike proteins (which COVID-19 also has) ... prion diseases are ones like mad cow disease ... to that effect, Bideon or someone close to him recently said that in the near future there will be a lot of Alzeimer's patients (which has a similar appearance to the prion disease), and, there have been recently releases by one or more medical/pharmacy company about "ground breaking Alzeimer's treatments" or something to that effect ... coincidences? you decide.
• Given the lack of liability, "bad batches" of products (aka, "vaccines") are more likely to occur. I suspect that this localized outbreak was the result of a particularly bad batch

Related to this, it seems that US census might be screening for the prion disease, see the thread here at Great Awakening for some discussion on that theory.

There's no doubt other sources for the prion disease claim above, Dr. Richard Fleming talks about it in passing in the first third of this great video, and he probably has the reference up on his website.