The inference tables knew FT8 on some bands and nothing on others: a 10.136 spot with a bare comment read as generic DATA — which is what every skimmerless spot of a DXpedition's 30 m FT8 slot did. The standard FT8/FT4 windows are added on 30 m, 60 m, 80 m (FT4), 17 m (FT4) and 12 m, in BOTH tables (backend band plan and frontend spot.ts), ahead of the wide segments they sit inside — order is the mechanism there.