I suspect he didn’t remember what it was and took a gamble on the reporter’s qualification that Johnson had voted against it and Trump opposed it, rather than sounding uninformed. Otherwise it’s just an extraordinarily stupid thing to admit in this situation.
No judgement on his skill as a producer but Kinberg sucks as a writer from what I’ve seen of his. He strikes me as a studio-friendly hack, and this is a dumb move to keep the franchise “safe” rather than trying better to make it interesting.