@LinusTechi strongly disagree with this sentiment. You use the software in your video. A video, which you produce to make money with constant ads for your store (even on the "adfree" floatplane), sponsors etc.That is commercial use and there is no way to sugar coat it.
That said, the dev's webpage is badly designed and doesn't make it clear enough and the drama he used to get you to subscribe to his service was stupid as hell.
I don't think it's justified to be outraged about it - i guess you ruffled some feathers with your hot takes and in the end you corrected a simple to fix error.