Key takeaway:

>Embodied carbon, the CO2 produced during the design, construction and decommissioning phases of a development, is slashed because buildings require lower volumes of carbon-intensive products such as concrete and steel.

So we are likely trading CO2 production for reduction of some physical properties, likely affecting the building lifespan, thermal insulation/soundproofing, etc. It would be interesting to see the details, but like all things sensationalist, the article is extremely sparse on them.