[npizzolato]

I read this article on an android phone in chrome, and while the text is a bit gray, it was still very easy to read. Unless your settings are way off, I can't imagine the colors are impossible to read outside of absurd hyperbole.

[vacri]

Something doesn't have to be "impossible to read" to make it inaccessible. Something written in Russian is inaccessible to me, as I don't read Russian. But it's not "impossible to read" - I can learn Russian; I can ask a friend; or most easily, I can use a translation tool to convert it to English. None of these are absurd hyperbole, but the content would be inaccessible without putting effort into it. When it comes to design, you generally want to avoid barriers to the user experience - and given that this is an article on a design topic concerning approachability and accessibility, my opinion is that it's fair game. Also, not everyone has 'normal' vision, which is another point to remember - text that is 'a little off' can be much worse for someone who is already near the boundaries.

In any case, it looks like the author has gone back and darkened the text (or am I imagining things?)