It's possible he sold them between June 30 2022 and now, but he didn't sell any since he bought a chunk of juniors in 2017-2018 and June 30 2022 so most likely he still owns them.
Saying that Pershing Square's investor presentation only including "FNMA" and "FMCC" (with no ticker names of the juniors) means Ackman owns no juniors is just plain lunacy, or perhaps wishful thinking.