A 2k landscape w/4k heightmap might work for the import on the landscape vertices, but for the actual per-pixel height on the heightmesh, that’s only 1/2 meter resolution. Fine on import but not runtime. As well a VT cannot feed another VT so it would break.
Nanite landscapes are better in the long run, just-as performant, much better lighting/culling. I don’t see the heightmesh doing much since Epic hasn’t updated it in a while.
I’d consider the tutorial outdated, but there are solid concepts therein.