I'm thinking he was complicit in an attempt to dupe his contituents.
He has to know an executive order will not override legislation.
As such, since the Democrats were shot down on "deem and pass" which would allow him to PRETEND he wasn't voting for Federally subsidized abortion, they gave him another way to pretend he wasn't voting for federally subsidized abortion.
It's obvious his values are for sale for the right price.