According to other documentation this version is supported via AG extension
May be this is a new extension version that was not test against MQ 8 because it is marked as EOL ?!
I would give it a try any how.
We have several customers using it with 8.x, but as it is no longer supported by IBM we no longer test with that version and cannot guarantee that it will keep working.
I will ask that it is updated on the general supported version page as well.