It is essential when relating to a covenant or contract that we understand our current relationship to it. If a contract is time limited, it is no longer in force after the stipulated ending date. I once had a six-month employment contract with a training facility. I could have gone there the day after the date of completion, but the work relationship established by the contract would no longer exist. Acting as if the contract was still in force would have caused considerable trouble.
Contractual relationships can end for other reasons, depending on the details of the contract.
This is all to say that it is not merely the existence of a contract that establishes its current status. The Sinai covenant is very specific as to the conditions of its enforcement. These warnings for the most part were not heeded and the covenant was broken. And if it is broken, it is no longer in force. Those who reject this notion, claiming that the Sinai covenant is eternal and its conditions are still binding, have introduced religious activities and concepts into the covenant.