That may be true. The design was expressly described in the WSJ article as "conceptual".
I'd love to see BIG's design for 200 Greenwich rise here
Terraced Tower Is Set to Rise Near the High Line
The Wall Street Journal
February 7, 2016
At the northern end of the High Line, Tishman Speyer is aiming to extend the park’s wild, natural beauty 65 stories into the air.
The developer plans to build a $3 billion-plus office tower in the Hudson Yards district that will feature cascading terraces decked with foliage, atriums with ceilings as high as 23 feet and a glass facade. Conceptual designs for what is being called
The Spiral will be formally unveiled Monday, launching the process of finding an anchor tenant.