Do I understand correctly that this is proprietary (closed-source) software, even though it's hosted on GitHub? This repository seems to contain two binary blobs without source code.
The query language and concepts which are explained in the documentation are an exciting/novel (at least to me) contribution and "out in the open" for everybody to see/discuss/adapt/improve upon. Let's not dismiss that because we can't read the source.
Contrary to what you state, it is _not_ clear from the README that this is a commercial venture, just that the author provides an email address for any queries in relation to licensing, and actually includes _no_ copyright or restrictions on running the code in the provided documentation. One might even assume that since we've been provided a copy of the binary without any notices, we might be free to run said code without restrictions... but really, who knows? Hence the OP's questions.
Yes, just because it is hosted on github does not mean it is required to be open-source, but the documentation doesn't include any information about the licensing terms, so it is a valid question (that is as yet unanswered in public).