They clearly didn’t speak to time line in the last couple PR. They just said they were starting detailed design in July. Then in the October update they stated they were doing prefab.
I’ve been doing construction management for over 4 years now for industrial and commercial applications.
You could say they were overselling it or depending on the investor to research how long it takes to design and build. Of course, they could have simply provided us with 3-4 milestones and dates and made all our lives easier. ;)
The July PR really gives you the best starting point and given my experience so far, they could just be getting permits to start ground work.
As for prefab, I was just on the 8th floor of a 24 story building going up. You can actually do a lot of prefab concrete and beams for floor and walls, which does significantly decrease construction time versus cutting, forming, welding, and pouring concrete at the site. They could start prefab well before the detailed design is approved/permitted.
I just saw a new 3 story office building go up near my house in about 5 months. It’s larger than the facility QMC is saying will be built.