The story does mention a reduced rate for G5 schools:
"As for television payouts, Colorado is expected to join the Big 12 at a pro rata basis, which is an average of $31.7 million in television revenue over the course of the league's new deal starting in 2025. Additional schools coming in at that rate would require some additional conversation, as Power 5 schools are expected to be pro rata -- assuming Fox and ESPN agree on that. For schools such as UConn and San Diego State, the tenor of that television payout conversation is expected to be different."