You're ignoring the part where the maintainer demonstrated that version 7 isn't a relicense of LGPL work but a complete rewrite based on public domain research and algorithms. That stack overflow article is irrelevant to this situation, and again, versions 6 and before have not been "taken over" they still exist exactly as they did a week ago and are still available to anyone that wants them in full license compliance. LGPL requires the source be made available, not that the source's distribution channels never be used for something else.