From our perspective, it is totally fine as long as you can get permission. I've actually not used that tool before but feel free to use it if it works! We fully support community tools so feel free and let us know how it goes!
In terms of getting permission / the legal aspect, maybe ask about it in the discord because im pretty sure whoever built this participated in one of the last game jams so hopefully they are still around and can answer you! Generally, it is probably safe to assume that they are open to people using it given they published it publicly on Github and wrote up a detailed ReadMe!