This has been a rumored "gonna happen" for a while, and appears to be closer to reality. That said, there is the "As soon as we have more precise information..." text so is it a done deal? Time will tell. In the meantime, plan on the possibility of a paid ticket being necessary to enter the monument/church starting July 1, 2023. This does not apply to attending worship services; not a time to try and sightsee the place.
The entry amount is not expected to be more than 5 euros. Check the website for more details as they become available.
https://www.pantheonroma.com/2023/06/08/from-july-1-the-visit-to-the-pantheon-will-be-paid-for/