Do not mistake Force Majeure as a 'Cancel Project' button. Just because they may attempt to test this clause, does not mean they have no intent on continuing the contract. This clause only frees them from obligation. Due to the nature of the current crisis, they may be able to utilize this clause temporarily. It may be that, during the initial height of the pandemic and when the government has forced businesses to essentially shut down, that could constitute as an unforeseen and unavoidable event otherwise known as an 'Act of God'. This would free SEAS from having to obligatorily pay its dues to the contractors; however, upon reopening, their obligations may be reenacted or they may enter into a new contract altogether.
There is some legal speculation going on obviously. I am no lawyer, but this does seem feasible.
What seems to occur is that SEAS has decided to defer payments without the approval or their contractors. Which I would believe is a huge mistake on their part. Prior to stopping payments, they should have made sure that they had some sort of payment plan or agreement struck before making any rash decisions. I think the contractors got the short end of the stick and are seriously upset about it.
This seems like a truly interesting legal debate that only the courts can truly decide ... that is ... unless a settlement is reached which would be much less dramatic.