I'm of two minds about this sort of thing. Yes, I know that blog article is peddling uneducated car care tips, which is a bit annoying.
But then I remember... they paid for their own cars, just like I did. If they want to screw up their paint, then that's on them. No skin off my back.
You can lead a horse to the water, but you can't make them drink. I firmly believe those who want to be educated about any subject will educate themselves eventually.
I wish I could be more incredulous, but I just can't find the heart to do so when I know that most of those people probably worked as hard for their cars as I did. I'm just a bit sad at their lack of care for something they worked and paid for.