It was a crawler with the user agent "hgf AlphaXCrawl/0.1 (+https://www.fim.uni-passau.de/data-science/forschung/open-se...)", operated by the University Passau and Open Search Foundation named on your landing page. It would be a mighty big coincidence if this wasn't a project connected to this endeavor, especially when it confirms being an experimental crawler of said project at the UA URL.