What do you mean the developer is milking the money? In every instance I can think of, the owner wishes they started and finished construction yesterday - it's the single biggest cost burden to move back and/or lengthen your construction. The incompetence or stupidity would be up to the architect, Gensler, which I can't rule out, but wouldn't put it high up on the list. Could be contractor related - not many re-clads over existing facades at this scale happen around here - that requires specialized talent or training, and at a scale larger than anything in or around Boston.
I have to believe its also possibly supply chain related, but even then, they must be at the bottom of the priority list since other projects seem to pick back up to speed once the supply issues are resolved. Wonder who their cladding supplier is and if they're in a unique circumstance.