It takes them a year usually to launch a monitor and they announce it when they get some early panels from panel manufacturer.
VG271U, XV272U, I don't have the rest opened so I think it was old stuff as in AUO old crapanel.
XV272U should be Innolux, you can buy it but not easily and everywhere, many still waiting. VG271U not sure, you can do the search can't you.
All in all probably gotta wait till Q2 2019 if you plan on seeing reviews in English with something useful in them other than the marketing news that are already around.