And does that page actually work? It definitely should not, in which case it should not get indexed either. Also, normally, this would have to be linked from somewhere for Google to find it ... Google works in mysterious ways though.
For example, if you try to link the physical path of a folder, you should get "forbidden", not something that Google indexes:
https://mjau-mjau.com/content/2.blog/3.preload-website/
(from https://mjau-mjau.com/blog/preload-website/)
If you have a link PM, yes it would be interesting to check.
For redirect, since the page gets intercepted to "forbidden" by server, as it should, we cannot redirect it from the X3 script. You can redirect with the
.htaccess file, but I won't try to make a common rule for something that should be happen.
You could do something like this:
Redirect 301 /content/1.photos http://www.domainname.com/photos