Looks like this may be true.
ESPN has an article on this:

https://www.espn.com/college-football/st...t-join-sec

If you think about it, this could be very good for the SEC. The revenue for the SEC will go up substantially. I suspect the SEC may generate income per school higher than even the Big Ten. I am not sure what the ACC can do about it as Texas and Oklahoma are too far from the ACC to make sense. I suspect the SEC and Big Ten will be at the top of the revenue per school race with the ACC and Pac 12 substantially behind. This may force Notre Dame's hand though because four power conferences mean that each could have an automatic champion in the playoff, although the SEC and Big Ten will want more of their teams in the playoff too.