Speaking as someone who's not very familiar with the Debian kernel development processes I am in favor of reverting the commit until we know for sure that the AWS Xen fleet upgrade is complete and pushing a new release, especially if it's possible to only apply the revert to the -cloud kernels.
Currently users of those older instance types in AWS have no other option than to stay on an old insecure kernel or switch to a different instance type (which may be impossible if they have reserved instances they need to utilize).
With the recent CVE-2022-0847 (Dirty Pipe) vulnerability they may end up in a situation where they reboot their machines to complete patching and then have them be rendered unusable.