Both showed up in my news feed this AM, LOL:
https://variety.com/2023/tv/global/bbc-viagra-drama-men-up-russell-t-davies-1235539437/
(Signs up as executive producer for another new show)
A few days later:
https://screenrant.com/doctor-who-russell-t-davies-future/
(Claims DW will be his sole focus for years to come)
Executive Producers don't do any work. The title is either a contractual obligation (big name actor gets listed as one) or a way of generating finance/selling your product by having a well-known producer attached.