Incognito Mode basically puts you in a mode as if you had installed a fresh, new instance of the browser every time, e.g. none of your past cookies can be accessed by any websites. Websites, though, can still use analytics APIs, including things like Google Analytics, to track you within that Incognito Mode session. They may also be able to correlate you by, for example, matching your IP address. And, to be clear, the Incognito Mode new window has always made this clear.
I can still be really concerned about Google's overall tracking and also point out this lawsuit is a bullshit money grab from lawyers hoping for a lotto payout.