It's not really attack on "Google Titan U2F" but on underlying NXP A700X chip - still very interesting. I've been involved in a lot of work around smartcards and digital signatures back in 2000's, it seems like today everyone is basically repeating the same mistakes and rediscovering the same vulnerabilities again :)

https://arstechnica.com/information-technology/2021/01/hackers-can-clone-google-titan-2fa-keys-using-a-side-channel-in-nxp-chips/