You're the one with the reading problem. It very clearly states that the GOP was going to form a committee to oversee the census bureau...which means they accepted the compromise worked out with the White House. And the Census department wasn't going to be taken out of the Commerce department, it was just going to work with the White House...something that has happened for umpteen censuses.
Maybe Gregg thought he wasn't going to have to work with the White House at all...just like all the other cabinet members don't work with the White House.
I suppose Gregg is lying, too, when he keeps repeating that the census questions weren't the reason he withdrew.