VUM with custom vendor images

Hi,

Are the predefined Critical Host Patches and vSAN Cluster baselines applicable when using custom vendor ESXi images?

(They show as non compliant but are these really meant to work/tested with vendor custom ESXi?)

If not how should one check for updates when using custom vendor ESXi images and can these checks/downloads be integrated in VUM?

Dell/HP are typical examples where custom images are used so not sure if VUM is still applicable to patch such vendor ESXi images.

Thanks