Based on the video in the article, it looks like the building still uses steel framing for the core structural elements. It looks like the subfloor is what uses cross laminated timber, and it seems that concrete is poured on top of that material to form the floor surface that you would actually see and work on top of in the data center. Although mass timber can be fire resistant, I don’t think it can match or exceed what is provided by steel and concrete. The video makes it look like ultimately, each room will be enclosed in steel and concrete effectively, since there will be ceiling panels on top covering CLT and concrete floors covering CLT, and walls will still be steel and concrete.
