I noticed it before, but now this user raised the issue explicitly, so we should react to it: Disable configurable product attribute value (radio button) if not available
The question was closed as off topic according to our rules (highlight added):
"Questions about third-party modules are generally off-topic because the scope of functionality and code are not available. For more information, see this meta post/answer." – Marius
And the user responds with an edit (see Revision):
As the third party module is on git therefore its code is available to all. that's why this may not be an off-topic question.
In previous meta discussions it has been made clear that no matter how popular and open source an extension is, StackExchange is not the right platform to support it. If we stick with this guideline, I think the closing reason should be rephrased, it looks like a bad excuse that doesn't address the actual reason.
Actually the meta post that is linked in the close reason states that
If third-party extension are an integral part of the Magento landscape, then certainly they should be on topic. As a matter of fact, if the developers of these extensions tend to have communities of their own, we should encourage them to become part of the ecosystem of this site.
This is how questions about Fooman extensions for example have been on topic in the past.
I don't have a suggestion for better rephrasing because I honestly cannot explain the rule in a non-axiomatic way. In past discussions I have taken a less strict stance on the topic, but if we don't want to raise the discussion again, it would be very helpful if the proponents of a strict "no third party support" came up with a better text for the close reason.