Here we go again with the nothing-burger rumors of the PS5... I remember back in 2016, there was PS5 media hype - it's now almost 2019 and the media got it all wrong ever since then.
The PS5 IS NOT coming in 2019 - Death Stranding, Last of Us 2, and Ghost of Tsushima will need to have launched before the PS5 hits shelves. The PS5 will most likely come out on Nov 2020.
You also can't say for sure that all those titles are indeed PS4. They can have been shifted for the PS5, and you wouldn't know about it. But IMO, a 2019 PS4 is unrealistic.