Force Disable Nintex External Relay Service

There is a known issue with auto provision of the Nintex External Relay Service. One of my clients needs to disable the service. How can this be achieved in SharePoint 2019?

Here is a link to the Technical Issue with Disable Auto Provision:

https://community.nintex.com/t5/Technical-Issues/Disable-Auto-Provision-Not-Working-As-Expected-for-Nintex/ta-p/86915