No Windows and they have to use the Fusee Gelee web launcher?

That’s pretty sad. You can easily use the Python script in Linux. Mac has Python too. Not sure the Mac Python will work, but I think the instructions mentioned brew.

What OS are they using? Clearly not Linux or macOS. Must be a pain making websites on an iPad.

More likely, they don’t know what they are talking about. You don’t need a GUI to launch it.