I think that’s complete bullshit. A different population means earlier rounds of apportionment will go different, not just that one round. Which means you can’t calculate the population difference for losing a seat within a single round of apportionment.

By my guessing and checking, MN loses a seat at 864 less population, not 26. As others have pointed out, it would lose that seat to NY, so no electoral difference in that map.