It is unethical, but the entire article is designed to convince people LinkedIn is outdated. It’s written on a blog that has 0 other submissions to hacker news. It was obviously a fluff piece written by someone trying to disrupt professional networks.
Webflow seems to be a Wix competitor - and in spite of her mentioning it's "template showcase" in the article as example of some sort of next generation LinkedIn community replacement - it's really a place to buy templates - and I would bet that no one has ever "built an audience there" much less gotten a gig (that's not directly related to a template they sold (or gave away)).