Ouch! That was a presumptuous and uninformed response from the dev.
Here's the situation:
The current release version (1.4) of this plugin creates topics only for posts that are published either through the full post editor or by XML-RPC. The development version currently adds support for posts that are scheduled by setting the "Date" field to a future time and those that are saved as a Draft and then published through the Quick Edit feature. No other ways of publishing a post will currently create a topic.
What you have asked for is support for posts published through GF. This is going to be implemented by improving support for using default settings when the full post editor was NOT used, e.g. when a plugin publishes a post.
But you will have to be patient. :) This is a feature that demands testing to make sure nothing that currently works is broken. Like I said above, I'll update this thread when a development version that includes this feature is posted.