A dollar is always a dollar, so it's hard to claim that $1 million in revenue is actually worth $10 million. OpenAI shares, on the other hand, aren't publicly traded, so it's much easier to claim they're worth $10 million when noone would actually be willing to buy for more than $1 million.

It's not necessarily manipulative but it's also not exactly an arms-length purchase of GPUs on the open market.