A lot of it is simply the usual fossil fuel interests, and the right-wing “think” tanks and politicians their endless money goes toward funding. They tell them to push nuclear because they know that the average person won’t accept pushing coal anymore, but nuclear can delay renewable rollouts for as long as possible, both because it takes a long time to build one, but also because there will be a long, drawn out political, legal and cultural shitfight (especially in Australia). Talking up methane (natural gas) as more than just a last resort fuel is also part of the tactic, along with attacking renewables directly, with “throw everything at it until something sticks” tactics with the hope that they can keep coal and gas around for just a few more years.