Yeah I don't think Tesla ever really cared about solar, they just had to talk the talk for a bit to help grease a very shady business deal (with strong echoes of the recently announced xAI/X deal).
I agree the whole thing was shady, but did they really never care about solar? I thought the solar roof was announced well after the SolarCity deal, and it seemed like they were serious about ramping that up for a while (though obviously that never really went anywhere or fulfilled any of the original promises either).