We reverted the title from “Google: FIDO keys more secure, easier to use, and more affordable than SMS OTP” to that of the article, since it appears to be neither misleading nor clickbait.
I don't totally agree with this title change. Of course FIDO security keys improve security. What is interesting about this article and the research conducted is the comparative effectiveness of FIDO keys versus the much more widely deployed mechanism of SMS OTP.
It only says "including" SMS OTP. If the study is based on Google internal use, it probably also includes Google's OTP app.