[sudosysgen]

I think you're misinterpreting the second tweet, I read it as "I can't publish a preprint myself since I'm not the only one working on it now, and my team doesn't feel our work is ready for publication". Of course it can still be bullshit but it makes sense that a biochemist doesn't have the means to test this material and that a credible physics institute wouldn't want to rush publication if they aren't sure of their results.