He said we'd be kicking a ball at Dens then the next ball we kick will be at the new stadium. He must have assumed both games will be at home.

That doesn't mean they won't be dismantling the stands to use the steel mind but seems to suggest the new place would be either commissioned before we leave Dens or the final commissioning is done over a close season. Can also suggest the new ground would be only partially built of course.