Even when the current funds available are insufficient, it can borrow from the federal government or issue debt to cover the insured deposits.

A situation which calls that borrowing capability into question would mean the economy is so bad the dollar is worthless.

This particular insurer is unlike others because it can ultimately edit entries in a database whenever it wants. As long as you are part of the group that is considered worth editing the database for, such as a depositor at one of the too-big-to-fail banks, then you have nothing to worry about.