Exactly, it's protecting large airlines from going under. This means there's less risk here than if the government had not intervened. Any future pandemic will likely result in a similar response, therefore, airline stocks have reduced risk of becoming worthless.

At a basic level, if you removed all demand for airlines, you'd say "well, airlines don't look like a great investment". But now the demand matters less during disasters because demand isn't actually keeping the company alive as in most businesses.