The HPE bundles show up, because they are in the baseline.
I'd suggest you create a separate fixed baseline for the Dell hosts which only contain VMware patches plus appropriate Dell patches (if available).
that I don't understand. Because all manufacturers are in the baseline. But e.g. Dell does not show up on a HPE server. Did here change the behavior with integrated VUM in VCSA 6.7 ?
I always thought if an update file is automatically chosen it is really needed and will be installed.