Yes, linkedin articles are still effective for organic visibility, but the game has changed somewhat, long form articles no longer have the massive reach they did two or three years ago, but if used strategically, they remain a powerful tool for positioning yourself as an expert.
The value today isn't in whether the article is read by thousands of people on linkedin, but rather in how google indexes it, linkedin articles typically appear in the top search results for your name or for specific topics in your industry, especially if you use relevant keywords in the title, this means that when someone searches for your name or your area of expertise, the first thing they find is that article, which builds your authority.
To truly benefit from linkedin, publish articles with in depth analysis, not generic three paragraph tips, don't expect linkedin to shower you with traffic, share the link in your feed, newsletter, and even other social media platforms to drive traffic yourself, if the article is good, people will save and share it, ultimately, the goal isn't to go viral on linkedin, it's to demonstrate your expertise when people research you, this indirect visibility is what ultimately opens doors.