To make matters worse, the title and featured image make it very clear that they have confused "macaroons" and "macarons."
Macaroon: https://en.wikipedia.org/wiki/Macaroon Macaron: https://en.wikipedia.org/wiki/Macaron
Macaroon: https://en.wikipedia.org/wiki/Macaroon Macaron: https://en.wikipedia.org/wiki/Macaron
The paper calls them Macaroons as a play on (browser) Cookies with layers (of caveats) - so clearly they meant macarons as well, since a macaroon doesn't have layers. Or at least, that's always been my interpretation of the name. It's possible it was just an arbitrary play on hMAC cookies and not the layers?
On "macaroon":
> The name "macaroon" is borrowed from French macaron
On "macaron":
> A macaron, or French macaroon, is a ...
came here to say this