A meteor might have punched into the original magma chamber, but then what has caused the continued episodes. I hope you looked at the map. I just read the article and found several errors. The mentioned the 640 kya eruption, but not the two previous ones going back to 2 my. Then they say it will be another 500 ky before the next one while most believe there is a good likelihood of one in the next 100 ky. They also try to make it really safe by saying it won’t be for 1/2 million years, but elsewhere I have read that since the last big one there have been about 70 small ones, so it could be building up to one of those.
The theory is the impacter punched a hole that triggered a hotspot 16 mya. The North American plate moves over the hotspot which feeds supervolcanic eruptions. What appears to be a line of eruptions are all from the same hotspot the plate above is moving not the hotspot.