Usually such contracts have force majeure exceptions. The dispute is whether a strike and pandemic is considered force majeure (usually a pandemic is), and whether those are proximate causes of the delays.
Mizrahi has been a total amateur with this
far too ambitious for his first major development, but it's going to be straightforward to argue that the pandemic was a major contributor to this delay. Not only was there a government mandated prohibition on construction for some time after the pandemic hit, for most of the remaining time, there were government regulatory challenges running a site that were not anticipated when the deal was made. Not just an
act of God, but an Act of Government – the one whose laws the court rules on.
The building was custom made to suit Apple – no, not just the retail space but the entire building was engineered the way it was to suit Apple's picky requests – and at this point the space is ready to be handed over for Apple to outfit their store in and the building podium and the sidewalk will be ready for the store opening by the time Apple finishes their own construction.
Ultimately, this will be decided by how a judge sees things but I'd say most judges will err on the side of maintaining a contract, specially given that Apple could take possession
today if they so choose.