(I am the author). It's definitely not a tease. The license will change within a week (max 2). This is my first open source project. The purpose is to validate the approach.
This has been a private project for a very long time. It can be argued that I should have figured out the license but the delay from my side reached a tipping point. I just thought "make it public, figure the rest later".
Unfortunately there is a lot of code license drama these days compared to a decade ago. For reference, see the Elasticsearch OSS License renege fiasco from January 2021.
https://www.infoq.com/news/2021/01/elastic-aws-open-source/
https://en.wikipedia.org/wiki/Elasticsearch#Licensing_change...
Keep up the good work!
I have changed the license to MIT.
Of course that doesn't matter too much because you're not going to sue people who use it, but it can still have potentially significant consequences for people who use the code.