Not closed source because they moved it to their self hosted gitlab servers instead of github, but when their servers got seized and shut down people had to archive the copies they had so the code could still be acessed, but this one wasn't recovered so it shows no one had a local copy of it, there may be even more that we didn't find yet that went missing and they didn't mirror it to github so even for the archives there is no "official" samourai source to compare to, only this 6 year outdated ones, in case someone forks their code like we are seeing now with ashigaru