I find that statement talking about two different updaters likely to be totally confusing.
It is specifically the “Software Updater” optional Component (that updates 3rd party software), not Avast AV Program/Definitions updater that is misbehaving and being discussed here.
and here: Avast suddenly updates other software without asking and without my consent
“Software Updater” is lately bundled as part of the “Cleanup” component, (not a separate listed component in its own right as once was)
The Cleanup compontent (that includes Software Updater) can be selected/deseleceted from Avast UI Menu using:
Settings>Troubleshooting>[ADD / MODIFY COMPONENTS].