Hello
If you installed easy engine you shouldn't have to follow Rahuls tutorials to build a multisite setup. EE will do it for you.
on a fresh server with easyengine.
sudo ee site create blechinger.io --wpsubdomain --php7 --wpredisIt has been a long time since I messed around with WordPress multisite so you'll have to figure out the mapping and whatnot. But that command should set you up with a damned fast install. So in short I would scrap what you have done so far and start over letting ee do the work for you.
Best regards