I'd be more inclined to grant linguistic leeway if the parent themselves hadn't jumped on someone else's turn of phrase.
Nutrition science has figured out some things to a high probability. It's still unsure and mystified by others. Don't throw the former out because the latter exists.
You're right, but I tend to think oversimplifying in the opposite direction to the trends of the last half century or so is warranted. The biggest problem I'd say we're facing today is people categorizing food into good and bad buckets, even if there is some truth to it.
Different types of fat have different nutritional effects and should be considered as different nutrients.