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I find many times that scientists report ominious sounding things like this, but the underlying data doesn't support it. I think they're just prone to hyperbole and overselling their results because it's what brings in funding.

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For anyone interested in the underlying data, I believe this is the most quoted piece by the popularizers:

https://pubs.er.usgs.gov/publication/pp1661F

...that has the full-fault events at ~500 year intervals, and the partial-fault events at ~240 year intervals. Last full fault event was January 26th, 1700.

You should look into the supporting data before making comments like this. The evidence for the timeline of past Cascadia zone megaquakes is actually quite solid. We can even corroborate the records from North American samples with samples from Japan when the resulting tsunamis caused damage there.

This is a good introduction if you want to know more: https://www.youtube.com/watch?v=UJ7Qc3bsxjI

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