Most likely a combination of both of that. I decided after the last one I watched never to watch a video by that content creator. But looking elsewhere:Bullshit or advanced technology
"Most EV batteries have a specific energy of under 300Wh/kg. CATL says its new battery almost doubles that figure, with a specific energy of 500Wh/kg
Unfortunately, the company has not released many other details, including what this battery would cost, how many times it can be recharged, or how much power it can produce (how fast the stored energy can be used)."
So not sure what the capacity is 500% of, maybe someone who has watched the video can comment. But the number looks very like the Wh/Kg in the above quote.