The link you have shared in your post will put Dell's OS image back including Bloatware.  1. Ensure your hard drive is not Encrypted ( windows setting > device encyption) turn it off  2. Use microsoft's media creation tool and create bootable USB with stock microsoft image  3. Reboot to F12 > Boot from USB  4. Install now > Custom installation  5. Now you can simply format the partition where current windows is installed and proceed.   
I have an Inspiron 3793 laptop. I want a clean installation of Windows, without any bloatware, on the partition I have reserved for Windows 10. I don't want to do anything on the other partitions. Reset or reinstall Windows 10 on your Dell computer says doing a 'Restore your Dell computer using Windows Push-Button Reset' "reinstalls Windows 10 operating system, removes all your personal files, removes apps and drivers you installed, removes any changes that are made to settings, and removes any apps that Dell installed". Are all these changes done only on a partition you specify, or are they done on every partition?
Reinstall Windows 10 on its partition, don't touch the other partitions