What is this fruit? Kumquat or what?

We had this discussion at our dinner table and the best we could do was take a wild guess and we decided it probably was a Kumquat.
It didn't take long to learn, once I got back to my computer, that we had been given cape gooseberries, also known as physalis
https://youtu.be/MzuM5qmbRuA

So then, What is a Kumquat?
https://youtu.be/i3-40ZRrGzA