Messenger Plus! never had spyware and it never will have spyware.
What the website is rambling on about is the toolbar that is bundled with Plus! but it only installs if you let it be installed. Furthermore, it is
not Spyware and
not dangerous to your PC, it also does
not mine personal data from your PC.
Below is a screenshot of the Messenger Plus! Live installer, as you can see you have an option whether or not to install it.