Knowing about ROM flashing and being able to do it or wanting to spend the time on it are very different things.

The author specifically says they want their phone to be a reliable appliance. I do not think they have the appetite for reflashing the ROM, nor should a consumer be required to do so.

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This is from the website, this is not something an average person should attempt:

Open a terminal on your host computer, change to the directory where you saved device-flasher, and then run:

shasum -a 256 device-flasher.darwin

And ensure the result says 04b4cf9912d853e0f108b42a756fd74db7a11cc6c951e05820e96d28ce56e543.