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If I steal code and release it with an open source license, that license is not valid. The author released his work open source based on an email from AMD. AMD is now saying that email was not legally binding thus the author did not have the right to release it under and open source license thus that license was not legally valid. If you had forked it and continued to use it, AMD could take you to court and say that the license you are operating under is legally invalid.
It’s not clear to me that AMD is in breach of contract, though I admit I haven’t looked into it in detail. But regardless, the contract is irrelevant to the open source thing unless that was in the terms of the contract.