When I think about it, when the competition started, all teams had covered stands so the point made is not technically correct.
Waitakere - The Trusts and had a stand built there after season 3 I think but then moved
ACFC - noted
Waikato - Was at Waikato Stadium. Moved
HBU - Park Island, still there
YHM - FMGC stadium but then moved
TW - Newtown Park but then moved
Otago - Carisbrook then the Caledonian then moved but have tried to stay at a covered location
Canty - English Park, still there.
I think the point is more that the standards of the competition has not been upheld but really its all semantics....
Otago started at Carisbrook (covered), moved to the Caledonian (covered) then to Sunnyvale (not covered) then to Tahuna (covered) and then Forsyth Barr and I think they split it with the Cale. So they have moved but tried to stay at a covered location.
Yes YHM did start at Memorial like you pointed out and moved to FMGC and then back to Memorial. Both are covered.