I’m not really sure what “inf seconds mean” but the update is only supposed to let the communities to be claimed if the account is terminated and there was no successful appeal to get the account back within the time period that supports allows appeals for.
Being banned for a year for example, such as the very rare cases we seen this year, wouldn’t allow the older holders of the group, or the people with admin/co-owner permission to claim the group, and it would remain untouched because the holder account is not terminated