Based on their CEO's angry refusal to explain further in TV interviews, it doesn't seem like they can, which is why eBay said that it wasn't a credible offer. It sounds like this is just a way to get a few more headlines for GameStop to keep their meme stock value a bit longer, along with a claim that they're being treated unfairly (which isn't substantive, but then again neither is the basis for their meme stock value, so that might be irrelevant to the ones this PR is attempting to target).