It is, but this doesn’t qualify. The claims by the original company are of a company that does not exist. And when you buy the assets of a company you are not

It is, but this doesn’t qualify. The claims by the original company are of a company that does not exist. And when you buy the assets of a company you are not obligated to continue business the same way nor fulfill any of their promises aside from the acquisition of specific contracts detailing otherwise. Whether they have any of the same employees is irrelevant. Besides being two different businesses, piercing the corporate veil is only done in very certain circumstances.