It’s possible that April 9th is the intended release date for Fearless, which were released very shortly after they were announced.
It’s possible Taylor Swift is going to revert to the more traditional release format for Fearless (Taylor’s Version) and is (hopefully!) planning to release some singles for the rerecorded album before the full album arrives, and maybe the play for that is April 9th.
If you look closely, the capital letters include A, P, R, I, L, N, I, N, T, H. As in…
If the Fearless rerecording announcement happened on 2/11, it seems only fitting that the album arrive on a date like 4/9 (4+9=13!).