Insurance company deal: if you pay us $X now, and then Y happens, we will make you whole, even though that cost may very well exceed $X.

Lutnick deal: we pay you $X' now, and if Y' happens, we collect everything which will substantively exceed $X'.

This is not insurance, its closer to shorting stocks.

Oh, one other thing: the insurance company has essentially nothing to do with Y at all, in the sense that they have no control over Y and generally speaking no involvement in it (think: accidents, floods, storms, fires). By contrast Lutnick is the Secretary of Commerce of the United States of America.