(IANAL.) … if the MIT license's warranty disclaimer doesn't hold up in this regard, what makes you think the GPL's would, or for that matter, any FOSS license'

(IANAL.) … if the MIT license's warranty disclaimer doesn't hold up in this regard, what makes you think the GPL's would, or for that matter, any FOSS license's such section? The result allegedly reached here is absurd. No amount of legalese can defend against absurd conclusions.