Hi Beth Sarim - yes of course Carl was onto something. But the weak point was he was looking to an outside authority. That outside authority itself can choose to change the date, then where are you?
The thing about Eze 40:1 is that it is the final scripture of just 7 that shows the WT's own maths is wrong. Therefore you take Jehovah's Himself as the authority not the authority of secular historians.
Ezekiel and Jeremiah were the prophets Jehovah used to express the numbers/arithmetic. You do the maths and you can see that it is Jehovah HImself who calls them out as wrong.
Result - as Korah opposed Moses so GB oppose Jehovah.
They've got some great videos on the official website about Korah.