Elton's Instagram page has good news about Cold Heart (PNAU Remix).
He writes that he is delighted the song has been certified Platinum by Aria Official, Gold by FIMI, and Silver by the BRITs.
ARIA is the official home of the Australian recording industry, ARIA Awards, ARIA Charts, and ARIA Hall of Fame. In ARIA's top 50 singles chart for the week of October 11, 2021, Elton and Dua Lipa's hit is in second place.
FIMI stands for the Federazione Industria Musicale Italiana, which keeps track of virtually all aspects of the music recording industry in Italy. The BRITs--or BRIT Awards--are accolades from the British Phonographic Industry.
There's now an acoustic version of Cold Heart at https://www.youtube.com/watch?v=6HSr6DQZ0mo.