verification blocked by https://bugzilla.redhat.com/show_bug.cgi?id=1983043
disregard the comment 1, I spoke too early, that issue does not block verification.
Verified on Sat 6.10 sn 9, host can be successfully removed even if the capsule it was registered through is down
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: Satellite 6.10 Release), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2021:4702