The “you mad bro” is found among internal Valve communication (Valve COO Scott Lynch to Erik Johnson and Newell, i.e. in the sense Johnson/Newell being “mad”, not Sweeney). It was particularly not sent out as a response to Sweeney. Another outlet already got tripped over this and had to make a correction: https://www.gamingonlinux.com/2024/03/valve-coo-on-epics-tim-sweeney-you-mad-bro-when-launching-the-epic-store/

This is not quite as sensational as some people are framing it.