The laws surrounding strata voting are fairly loose, provided there is no intention to deliberately mislead, so I wouldn’t worry about the validity of previous votes.
And I think the AGM could cover both committee and general meeting votes, if it’s happening soon, but the committee could and should tidy this up if the AGM is some time away.
I suspect the post-Covid rules were brought in to cover schemes that hadn’t already gone to electronic votes but might want to