Task not available for release definition?

[TASlavens]

Hello! From the Marketplace overview of the extension:

I find tagging or branching sources on every build is too much noise. There are so many builds that are just thrown away and never make it out of CI. I prefer to tag\branch when I get to a specific environment with the artifacts, usually UAT or production. This is a vsts plugin that will git tag or branch artifact source code with the release name.

I've installed version 9.0.0 of the extension into our non-production instance of on-prem AzDOS 2019u1.1p4 running on Win2016. The quoted text above strongly implies that the task should be available for release definitions, but here it is only available for build definitions. I have not tried it with a YAML pipeline, and in any case we have not moved to YAML yet, so that is not an option for us. From the questions on the Marketplace Q&A and a couple of issues here, it looks like this was not a problem in version 8.0.1 and earlier. Unfortunately, I haven't had time to dig into the task implementation.

Suggestions? Thanks in advance.

Regards,
Tom