They said the same back in 2017 and people laughed at it. FIA doesn't want to get involved in this at all. Not in a meaningful way
https://www.autosport.com/f1/news/russi ... 9/5016359/
Toro Rosso's Carlos Sainz said he "nearly laughed" when he read the FIA's verdict and comments from Force India's Sergio Perez who said Ferrari and Renault had caught Mercedes.
"I saw news coming out this week about the FIA that the top three engines are within three tenths and I nearly put a comment on Twitter laughing at it," said the Spaniard after qualifying 11th.
"And then [Force India's Sergio] Perez saying 'yes, it's true, it's true'.
"I nearly laughed at it - I think Max also nearly laughed.
"We've made progress, Renault has made progress.
"If not [Nico] Hulkenberg would not be where he is, but we are definitely not closer than half a second compared to Mercedes, especially in qualifying.
"In the race it's not that bad, but in qualifying the Mercedes engine has half a second or more."
In 2018 renault then went even further backwards, so this whole parity thing is a farce, always has been.