It’s not clear to which poster above you are referring.
However, based on what @edavignon posted above, adults who are not current registered leaders will no longer be able to be part of the adult leader roster in Scoutbook, regardless of what training they have or have not taken.
Parents who are connected to their scouts should remain connected to their scouts with parent access, assuming things go to plan. That should similarly be independent of what training they have or have not taken, again assuming that the rollout goes per plan. They should continue to have access to their scout(s), receive emails and event announcements through Scoutbook as before, based on everything I’ve seen from SUAC about this planned change.