The first one is, just like it says, a bug, and apparently a bug that Apple fixed on their website. The second one is Wired using a terrible web font. Neither the possibility of having fixable bugs nor the option of choosing a terrible font strike me as particularly strong arguments against web fonts. You are already free to use system fonts at terrible sizes or contrast ratios, and many sites definitely do that.
I'm the author of that Medium article. The "second one" you referred to isn't the second bug I reported – it's just an aside on Wired's crazy headline font. They've since replaced it with a normal readable font...
