To settle a years-long lawsuit, Google has agreed to delete “billions of data records” collected from users of “Incognito mode,” illuminating the pitfalls of relying on Chrome to protect your privacy.
chromium based browsers like Vivaldi report this information back to Google too
Probably not. The "good" Chromium forks (that excludes Edge and Opera for example) usually remove this kind of thing as much as possible. Also, the article explicitly mentions Chrome so it seemingly hasn't been a thing in Chromium anyway.
That being said, Vivaldi is not open source so only their devs can really answer the question what data they collect on you. I'd suggest Librewolf as an open source alternative. It's not based on Chromium and focuses on preventing sites from fingerprinting/profiling you.