It is an advertisement for the author’s book, disguised as an NYT Opinion piece.
All he really says in the NYT piece is spending,
. . . about $370 million a year to bring the rest of the world up to the same level of volcanic monitoring that the United States has, which would lessen the chance of being surprised by a supereruption and thus reduce the potential death toll.
He never goes on to say how to reduce the potential death toll.
What? We move everyone out of the area to the coasts?
And based off the other reports by more scientific minds, computer models, graphs and charts, it is a lot more than just those few states surrounding Yellowstone.