And yes, this is a joke tutorial. There is no "Allow Web Store Removal" flag in Chrome. I used another app Imgflip with a working Remove from Chrome button and inspect elemented the chrome://apps page so it appears it can be removed.
Want to remove the Web Store from Chrome? Normally, it is disabled, but you can turn on a flag; Once you enable this flag, you will be able to remove the Web Store from Chrome! Be warned though, once you remove it, Chrome will be extension-less from now on. Enable this flag and restart your Chrome browser. It's called Allow Web Store Removal.