If you read it carefully, you'll notice that the blog post misrepresents the AMD response.

The blog post title is "AMD won't fix", but the actual response that is quoted in the post doesn't actually say that! It doesn't say anything about will or won't fix, it just says "out of scope", and it's pretty reasonable to interpret this as "out of scope for receiving a bug bounty".

It's pretty careless wording on the part of whoever wrote the response and just invites this kind of PR disaster, but on the substance of the vulnerability it doesn't suggest a problem.

How's that? What do you think the purpose of a bug bounty is? If you think it's "to eradicate all bugs", no, very no.