Yep, the site gets wiped in a new administration.

The page linked is now hosted here: https://trumpwhitehouse.archives.gov/briefings-statements/st...

Archived URL from the White House: https://trumpwhitehouse.archives.gov/briefings-statements/st...

Happens every time we get a new president. Nothing unusual about it. Everything from Trumps whitehouse.gov site is now located at https://trumpwhitehouse.archives.gov