Removing gnome from Ubuntu 18.04 after changing to KDE Plasma

I have recently switched from Win10 to Ubuntu 18.04. I decided to switch to the KDE Plasma DE, using the instructions on this page:

https://vitux.com/how-to-install-the-kde-plasma-desktop-on-ubuntu-18-04-lts/

I'm loving KDE and don't have any plans to use gnome again. So I followed the instructions on this page:

How can I remove Gnome Desktop Environment without messing Unity DE? (Ubuntu 16.04)

However, when I enter the first command in konsole, I get the following response:

Reading package lists... Done Building dependency tree Reading
state information... Done Package 'ubuntu-gnome-desktop' is not
installed, so not removed 0 to upgrade, 0 to newly install, 0 to
remove and 0 not to upgrade.

And when I enter the second, I get:

Reading package lists... Done Building dependency tree Reading
state information... Done Package 'gnome-shell' is not installed, so
not removed 0 to upgrade, 0 to newly install, 0 to remove and 0 not to
upgrade.

Does this mean the installation automatically removed gnome?