He was wrong to remove Snell by the common sense method (Cy Young winner cruising in a big game) AND wrong on the analytics (Betts is worse vs. lefties, and worse the SECOND time he faces a batter, than the THIRD.)
He was going by the analytics book, rather than analyzing the situation.
Jomboy (NSFW - Warning) analysis here: https://youtu.be/u3G8QytAKWA