I copy and pasted this with my mouse from your posted link.

Right-click using the touchpad with a two-finger click
Chromebook touchpads might look like any other laptop touchpad, but you can't right-click on it in the corner like you would on a Windows laptop or a MacBook. Instead, you're going to have to right-click on your touchpad by using two fingers instead. This is the number one way to right-click on a Chromebook.

Right-click using the touchpad and the Alt key
Are you not a fan of the two-finger click method? Well, you can also use a single click combined with the Alt key to generate a right click. To do this, simply hold down the Alt key on your keyboard while performing a single click on the touchpad. This generates the exact same menu as the two-finger click discussed above.

AND ... The touchpad still stinks.😂