INSPIRE  is a High-Energy Physics (HEP) literature database. It is possible to have private views. See this page for information about how to login to see LArSoft documents. There is not a  login link on the main page, because it would be misleading for most INSPIRE users. None of the notes collections of any experiment is accessible via the main landing page of INSPIRE. So you have to login to see the ‘LArSoft Notes’ document, but that means they aren’t publicly available even though they’re in INSPIRE.