the website doesn't contain any link to source code apart from a broken link called "git repository" which leads nowhere. using google i found https://github.com/libbitcoin/libbitcoin which seems to be a library not an application (full node implementation) and it is in C++ so i wouldn't be surprised if most of it was copy of bitcoin core code.

last commit belongs to Nov 23, 2017! it doesn't seem that active either.