The blog post is good! It makes an important point. But its conclusion is badly flawed.
Conclusion is fine. The clickbait title is the problem.
Reduces in the sense that using dnscrypt simply increases the number of third parties that can see what you're doing. I think that is valid.
But so does a VPN when you use a VPN the VPN provider can see what you are doing, they are even in a better position to launch MItM attacks against you than many adversaries.
No it doesn't. Using a VPN changes which third parties can see what you're doing. It doesn't increase the number of them. Using a VPN removes your ISP from that list. Using DNSCrypt does not.