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They've used quarters as a reference point for forever, and coins are also flat, so I guess it's not a problem.

The common grapefruit diameter is smaller than the diameter of a DVD. People like to reference the size people in the area might be more familiar. When you say grapefruit, I don't think of something the size of a DVD. That would be an extra large grapefruit based on the sizes and pricing of all of the stores that offer grapefruits I have ever seen. The DVD diameter sized citrus fruit I'm familiar would be pomelos, and not all stores carry them.

If you routinely see grapefruit with the same diameter as a DVD that it is a normal measurement for you then, that's great for you, but it is not the normal

At risk of being a bit unempathetic, your comment seems a bit obtuse.

It’s pretty clear that it’s referring to the diameter of the hail. Other flat objects are commonly used to indicate diameter. Mostly coins.

The flat part wasn't confusing, was just quibbling about the odd over-explaining of the size (fwiw in the video the person says "baseball" and "softball", and indeed I didn't see any DVD-sized ones).