You can only get a work visa if you are employed by a Singapore-registered company. Whether they are (or were) a subsidiary of an Indian company does not matter. You do not need to inform MoM of their closing, as they can already see that in the database.
I think you are wasting your time here worrying about things you cannot influence. Or maybe I do not understand what the actual issue is - many people have worked in the past for employers that do not exist any more now, this is normal and not a problem!