They've got it about right. Figuring if Mets win with Harvey then LA will throw Kershaw on 3 days and then Greinke.
You're likely better off waiting until after today's game if you like LA and think Harvey wins. In a 1-2 hole odds likely to be LA plus money, but still with Kershaw and Greinke on the horizon.
I wouldn't bet the series today unless you like NY. I think Harvey wins.