"In general, manufacturers recommend that for engines which won’t be flown for 30 days or more, a preservation regime should be instigated." So, one or the other.
"The desired flight time for air cooled engines is at least one continuous hour at oil temperatures of 165°F to 200°F at intervals not to exceed 30 days ..." so that is what I do.
Yep, same rules apply now. Closed businesses may undertake essential maintenance.
Yep, CASA email is just an opinion. I only have that extract however I understand it is quite recent.