What happened to arm64/aarch64 buildbot?

[Jan Beich]

- https://pkg-status.freebsd.org/ says the last build used r468170
- https://thunderx1.nyi.freebsd.org/ is not accessible

For one, I'm trying to figure out if www/firefox is busted after 60.0
update but bug 221185 prevents me from building it locally.