> Having trouble spelling doesn’t make you stupid

It does suggest that what you’re reading hasn’t been proofed. That increases the chances of other, more significant errors, e.g. ones in fact checking, logic or thoroughness.

That's what spell checkers are for. There is a point at which poor spelling will begin to undermine the legitimacy of your thoughts as the reader becomes dubious as to the care you put into writing it. I do not think this is necessarily the case with this article, but just wanted to illustrate that correct spelling is valuable.

It does show a lack of care though.

I think OP's point is that rather than some authoritative oracle, this guy is just a guy.

He makes interesting points, but take them all with a grain of salt.

No but it does if you are writing a essay on the economy. And since this is a service that provides "snapshot" articles on the world, spelling is important.

The two are strongly correlated though.

It would still fail in school, regardless of how smart the student is. Having someone edit before publishing always makes sense even if your English is absolutely perfect. If you make such glaring spelling mistakes and ignore the coloured squiggly underscore, what other words and phrases leave the reader with the wrong perception or meaning?

I have found that those who are laser focused on spelling and grammar tend to lack a proclivity for novel thought. As such when confronted with new ideas, rather than dismissing the idea based on some sort of logical flaw they dismiss it based on superficial surface level details.

It means there is a higher probability of being stupid.