Every large compute announcement is a statement of intent priced as a fact. Between the announcement and the first rack sit a land position, a grid connection, a substation, transformers on a multi-year lead time, water or air cooling capacity, and a construction schedule that only one of those things has to break.
The binding constraint is almost never land or capital. It is firm power that can be delivered on the date the build needs it, which is why a site's real schedule is written in an interconnection queue rather than in a corporate deck.