Yep,
you still missing the php support on your WebServer. Therefore the page is displaying the real code instead of the website.
It might be easier to start from scratch if you not mind. Means remove all web server, php, database as well as NectCloud components and install NetCloud freshly from dietpi-software. This should pull the required components automatically and configure it the right way.
But I’m not sure if you have other software packaged running that require one of the components like web server or database. And removing them could cause other issues. So it’s up to you 