It isn't an error. If you click into one of the individual data sources (links available on the home page), you see messages like this:

> This page is being updated. It will post records of White House visitors on an ongoing basis, once they become available.

> This page is being updated. It will post records of White House staff salaries as the data becomes available for the Trump Administration.

I'd argue that Trump probably doesn't have a clue this even exist, someone else dictated it's archival/removal.