The
cross-gen PS4 versions of Spider-Man / SM Miles Morales, Sackboy, and Horizon FW were listed in announcements attached to the Sept 2020 event, not that first June 2020 event. This news wasn't in the videos, it was in separate press releases.
GT7 and God of War were mentioned in a PS Blog interview last June with Herman Hulst (who would know these things) that, "Where it makes sense to develop a title for both PS4 and PS5 — for Horizon Forbidden West, the next God of War, GT7 — we’ll continue looking at that. "
Technically, the official listing for
Gran Turismo 7 is still PS5 (God of War 'Ragnarok' does not yet have an official listing, just that teaser mention in the video.) However, Sony has done nothing to say otherwise when that interview hint and it led to the obvious conclusion that they've already looked and are done looking and are doing the cross-gen versions.
In almost all of these cases, the games were announced as part of a PS5 showcase, but otherwise not announced as only being next-gen releases. Only GT7 ever listed "PlayStation 5 Exclusive".
Of course, until September, we didn't know that cross-gen was part of Sony's gameplan (it seemed impossible even, given the "We believe in generations" Jim Ryan quote,) so nobody could have known until then (although it has been weird since, in one moment, people saw Miles, Horizon and GT7 and flipped their lids about how next-gen they looked, but then the cross-gen announcement came out and you started to hear a lot of, "Oh yeah, you can totally tell...".)