I had the opportunity to join a site tour of The Well yesterday, read my thoughts with more photos at: https://toronto.urbanize.city/post/urbanize-toronto-tours-well
What was old is new again. Reminds me of another Foster+Partners design at 270 Park Avenue, but The One is much more elegant IMO.
Source: https://skyscraperpage.com/forum/showthread.php?s=e2fbb8630125c60cb55587f035c6aa6d&t=232215&page=180
It does appear to be temporary scaffolding. IIRC the first mechanical level is also where the protective canopy will be installed to allow the base of the building to be occupied as the building progresses.