I can't imagine where you got that conclusion from. this news only means that "playstation will not participate in E3 2019", just this! Any other deduction is just speculations or nonsenses
Well because they xancelled PSX and E3. These a big events where they could announce release dates for their upcoming games and get lots of press. Unless we get a release date at TGS i think it's fair to assume no major Sony game is coming out first half 2019(besides Days Gone) and Sonys second half is usually not full of exclusives since they let third parties get the spotlight. The PS5 is gonna come out in 2020 and it would make sense ot have these major games be cross gen.