Namor actor Tenoch Huerta also wants to know what the Talokan king was doing during Avengers: Infinity War. The two epic Avengers films used to close out the Infinity Saga featured events that completely changed the future of the Marvel Cinematic Universe, so much so that new projects cannot escape questions about it. Black Panther: Wakanda Forever is no different in this regard. The Phase 4 movie provided some answers about who ruled Wakanda after T'Challa was snapped by Thanos or why Nakia was not present for the Wakanda fight, but other questions related to the universe-wide event also were created.
https://screenrant.com/namor-mcu-avengers-infinity-war-location/