Claiming that previous versions of the GPL aren't valid is a complete misunderstanding of what the licenses are and how they work. The author gets to choose the license for their work and that license stays until they choose to change it, either through direct action or including a clause in the release that says "and any future versions" or similar.
Claiming that GPLv2 is invalid simply because the FSF wrote GPLv3 is muddying the issue more than people usually do.
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