It seems there is some confusion. The above guide you posted is for the Blesta auto install module i.e. the Blesta auto install module is supported on cPanel, Plesk, CentOS Web Panel.
However the Blesta script itself works on all panels. All the scripts including SuiteCRM and Invoice Ninja works on all panels supported by Softaculous.
P.S : Blesta auto install module is a module for Blesta which can auto install applications on the control panel accounts created by Blesta.