I’m not sure where do they say that but that’s false nevertheless.
From the official release notes, at the PS4/Switch section:
“Supported IDE: Visual Studio 2017, Visual Studio 2015”
Xbox One:
“Supported IDE: Visual Studio 2017”
Build farm support:
“Visual Studio - Visual Studio 2017 v15.9.4 toolchain (14.16.27023) and Windows 10 SDK (10.0.16299.0)”
Also, the following suggests that not even in core UBT is VS 2019 fully supported:
“New: UBT now outputs an error when compiling Unreal Engine with known codegen issues, and excludes toolchain versions when sorting compilers for use. Note that the Visual Studio 2019 16.3 toolchain (14.23.xxxxx) is currently blacklisted.”
In summary, although there is some VS 2019 support, VS 2017 is definitely the official way to go.