Read the article. The exploit is for all firmware-loading keyboards, including those manufactured by Microsoft and Logitech.
The headline highlights Apple’s wireless keyboard because headlines involving Apple get clicked more: reference the GSM SMS exploit which was demonstrated on a Sony Ericsson phone, yet was reported in the tech media as an iPhone exploit.
I noticed the iPhone thing at the time. There would be a whole article about this “iPhone” vulnerability, and all the way at the bottom it would say in passing that other smart phones are affected too.