Verified in Satellite 6.1.10 Snap 3
Followed the step outlined here (https://bugzilla.redhat.com/show_bug.cgi?id=1344053#c4). The subscriptions were all removed as expected. See attached screenshots for verification.
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, 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/RHBA-2016:1938