Because the fotos have code veronica....Say this is true. With out those photos before code veronicas reveal how do we know for sure those photos were code veronica? With so many resident evil projects going on at the time are you 100%sure from memory alone those photos were code veronica? I'm only 28 so 12 years younger than you but can still find articles from the late 90s so somewhere out there should be some magazine clipping or advertisement of code veronica being the true sequel to re2. Also you seem to be wrong on code veronicas reveal, it was officially revealed n August of 1998 and tgs 1998 was in March and October that year.
Appearantly the real re3 was directed by Kamiya in 1998 and would feature hunk on a ship trying to collect a g sample. That got scrapped l because they couldn't finish on time so promoted a spin off in development on ps1 to re3 nemesis and scrapped the hunk game. https://www.vg247.com/resident-evil-3-nemesis-began-life-as-a-spin-off
At no point does anyone say code veronica was developed as re3 in mind.
Even shinji Mikami said that code veronica was made because they couldnt port re2 to Saturn so they came up with the idea of making a new game for Sega fans. Also this theoretical sony contract for re1 - re3 does not have any substance evidence of actually existing. Shinji Mikami did not was the ps1 spinoff to be re3 but decided to go along when people brought up to him sales wise calling it re3 would make the most sense since the ps1 was a super successful console. No offical source ever mentions a contract anywhere from sony
I mean the marketing for the game was based in the "code veronica".