The creator of Opera sold the company and created Vivaldi. That's it. To me that means Vivaldi is now the "true Opera". I could replace "Chinese consortium" with "Danish consortium" or "French consortium" and it would mean exactly the same thing (not to mention these are not my words, but copy+pasted from Wikipedia). You seem to be jumping to conclusions about my intentions.
We don't call Deno the new "true Node" even if the founder is the same. Rally, I can't think of any case where X stops being "truly X" because it is sold. Vivaldi is Vivaldi, Opera is Opera.
Why? The goals are different, the support is different, the stability is different, the use cases are different, the compatibility is different... all in all they're almost as different as Opera and Vivaldi.
I use Vivaldi every day, and like it very much.