I am repeating my answer that In My Humble Opinion it is negative that a VectorTileLayer can deal with KML/KMZ. It can not display KML/KMZ.
Furthermore ArcGIS API for JS 3.14 uses "esri/layers/KMLLayer" class to display KML/KMZ and it is not present in Beta 2.
If you have simple KML/KMZ files you should write simple wrapper to parse your KMLs/KMZs to primitive beta 2 symbols.