No, we don't. In 2017 the positive rumours turned out to be true on the chassis/aero side and in 2018 on PU side too. What cost the title in 2017 was the lack of power and in 2018 the numerous crashes and strategic mistakes.
We heard negative things about the 2019 car and also 2020 car. In 2019 there was talk of the engineers not being entirely happy with the aero concept. The car turned out to be slow in the corners. At least until the upgrades mid-season.
As for the 2021 car we heard news of clear improvement and the goal to finish the season 3rd even before it started and guess what, it happened.
Actually there has always been correlation between the talk and the actual performance to some degree.