I'm with jack111111. They didn't want to go around, they were sure the runway would clear in time, so they just watched carefully and landed. Then they invented some random story about radio problems. Why would they be fiddling with radios on short final?
As for the red light, have you ever actually seen one of these things even when you're trying, even when you know exactly where the tower is and you're staring at it? I confess that on the one occasion when I landed nordo, after a total electrical failure on take off, I completely failed to look for a green (or red) light. Bit busy aviating, getting the gear down with the manual pump, etc etc.