The entire context of the conversation was that they wanted to let people know that JI didn't actually find most or all of the lights on as he/they had originally said (not b/c other people were exaggerating it).
DB talked about JI being an electrician and always aware of the lights, always going behind her turning them off. She was clearly saying that because of his hypervigilance with lights, he had exaggerated when he said most/all (<---take your pick, doesn't matter) the lights were on.
They didn't compare notes on the lights early on because they were focused solely on Lisa, she said. Now that they've had a chance to sort it out, they want us to know that only a few specific lights were actually on.
The point really wasn't about outsiders exaggerating anything. The point was that they, after having time to reflect on it, wanted to clarify that their original contention about the number of lights was incorrect and that the change shouldn't be viewed as an inconsistency, but rather a clarification.