I'm not sure it actually says that - it says that Tesla has signed a deal for BYD LFP batteries, and it says that BYD blade battery packs are energy dense, but

I'm not sure it actually says that - it says that Tesla has signed a deal for BYD LFP batteries, and it says that BYD blade battery packs are energy dense, but it doesn't actually link those two and say "Tesla has signed a deal for BYD blade battery packs". One of the linked articles does report earlier rumours around Tesla using blade battery packs from BYD, but then also has quotes from BYD saying "we never said that".