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I may infer from this that most of the older packages just did not contain Linux as an afterthought because of the newer packages you can get now. If Mac updates were added later, they were probably bugfixes. Linux is an afterthought after applying what was relevant.
The May date is the time they added Mac and Linux support. Anything later would be different circumstances. That is, you can get individual games now, and Linux is appended because it qualifies. Sonic Hits Collection was released in 2013, so this would have been availiable much earlier. Such as the condition with other collections, you cannot obtain this on Steam anymore without a key and this would less likely have either updates.