The Bulk Errata Wizard on the new Hosts Overview page always shows all Errata available on the system (within the Organization).

At least it should limit the displayed Errata to the ones installable on any Host.

Ideally, it should also limit the Errata to the ones installable on the selected hosts. IMHO we would need to adapt the API for that, because it can only be limited to one specific host or all within the Organization.