Yup I just got to step 11 in your guide and I can still access it fine via my ip:450.
I deployed swag and checked all my logs, no errors reports! Although nextclouddb seems to be stuck on this step and hasnt sent over a "DONE".
here's my swag logs
I'll carry on with the steps now, fingers crossed
Can you get to the swag park page?... Cuz I'm getting to yours just fine and it appears all is normal (note the padlock by the url)