I don't know if this was rhetorical or not, but I read through the blog and found no indication that it's open-source. The only platforms I saw mentioned were macOS and iOS (Android was mentioned once but I think it was more of a future thing) and it appears the final price will be $160 per year.
From what I saw of the website and the blog posts, I'm not sure how this is better than Obsidian. The original comment mentions a nicer UI but the UI doesn't seem that much different. One of the things I love about Obsidian is how customizable the UI actually is.