Ah, okay. My guess is he probably let "settle.network" expire, and the owners of the unrelated "settlenetwork.com" bought the domain and redirected it for anti-brand confusion, SEO or latent traffic reasons. I don't see anything technically related across them. The original settle.network was "without a blockchain", settlenetwork.com is very much "with a blockchain".
Edit: The "settle.network" domain as it sits now was first registered in 2019, well after the last activity on the github repo. So yeah, he let the domain lapse out.
Well, as I said, it's all "curious". Since the OP of this thread is in fact the owner of that repo (thus the README), possibly he can chime in and clear up the confusion. /g (I am just rubber necking here!)
I see a link to https://settle.network which isn't the same as https://settlenetwork.com