Snark aside, this is a legitimate question. I could not climb over the paywall to read TFA to find out myself.
I've seen (and/or worked in) many "normal-non-AI" datacenters in Venezuela, Mexico, Colombia and Poland*, and studied normal Datacenter best practices documents, and the ammount of wood used in their construction is minimal. Most of the floors are done in concrete, the walls are done in concrete (poured or pre-tensed), or heavy brick, the ceilings are concrete or metallic (to be able to hold the weight of the AC units)
Not only that, AI datacenters DO NOT use false floors, wood or otherwise. The weight of the Racks would collapse them, not only that, even the normal concrete floors of a normal datacenter is insuficient for AI racks, you need reinforced concrete floors to hold the weight of the racks used. Also, fiber is very lightweight, and electricity arrives in 800VDC or 480VAC, so cables are lighter and can be run overhead.This also simplifies maintenance of the cables.
Also, AI Datacenters are Large Open Spaces, there are no subdivisions for different groups, or "colo customers"
So, all these carpenters are doing what? So many kittechenettes? The entry halls?
I'd would undestand plumbers, as much of this gear is liquid cooled.
So What are the "unprecedented number of carpenters" for?
* Poland is the odd man out, Nokia invited us to see a "reference customer"