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There is a logo at the top that says WSJ OPINION and it says "OPINION COMMENTARY" above the headline.

Maybe it's easy to miss for someone's first time on the site, but I've personally never had any issue.

Also when WSJ posts to social media they prefix the headline with "Opinion"

It’s in squished, gray hard to read type, and not in the bounding box formed by the article title and the story.

I’m sure an eye tracker study would show that few people read that part of the page.

There is a sticky header with the WSJ OPINION logo as your scroll down the article [1]

What more do you want?

The URL does however not reflect this, while it could. URLs are supposed to be informative.

Nobody outside of tech reads urls, nobody.

People in tech usually don't either.