The project is licensed under a Business Source License [1] which wouldn't be widely considered open source due to the limitations it's placing on use, so advertising this as open source may be misleading to many. Source available is a more common term for these kinds of license.
If you're interested in why I think this distinction matters, I've written some thoughts about that on my blog [2].
If you're interested in why I think this distinction matters, I've written some thoughts about that on my blog [2].
[1] https://github.com/npi-ai/npi/blob/ 991bdc7e0c9830c89a81b07b0ebabca9b506677a/LICENSE
[2] https://danb.me/blog/open-source-available-distinction/