Hey Sylarkz,
If you had played Apex since launch, it looks like that must have been on a different EA account. This particular EA account hadn't even launched Apex on any platform until some time after you mentioned last playing back in April 2025. It's also never launched the game on PlayStation.
This combined with your mention that your PlayStation account is not connected here indicates there's likely another account where your PlayStation account is connected, and that's likely the EA account with all your progress.
If you open an incognito mode window and try logging in to the EA Help site, try using the option to log in with your PlayStation info instead of just logging in manually. That should get you to whichever EA account was linked to your PlayStation account. If you're wanting to use that progress but play on Steam, you'd need to link your Steam to that EA account instead at that point.