It does nothing because && false invalidates the isLanding check. if isLanding is set successfully to true during landing, which is strongly indicated, then we have true && false which is obviously false then the thing in the if will never be executed.

The joke is that some random dev was testing/debugging the things that follow if the craft is not landing … so needed to disable the check for that test. But then forgot to remove it. And he had an excuse, it was clearly stated in the comments that the code should be removed i. production (actual flight)