"Aluminium carpentry" is a thing around here: people that build and install window frames, metal gazebos, conference stalls, custom sheds and so on. These huge data centers probably aren't using the quaint standard data center server cabinets.

A mason would be doing the concrete work. Metal studs and doors is usually done by the drywall and framer subcontractors - which could also be a carpenter - but drywall at datacenter or any commercial scale is almost always done by a framer and drywall specialist. They headline is using the wrong term.