Am I misreading something? They said their system booted faster than the slow debian boot that you've shown, I think. That took (including the network time) like 8s to boot. It isn't surprising that they have a system that boots in 8s. As you note in the comment, it hangs on the network, but that's part of the boot.

It is an irrelevant comparison, but there's no reason to call them a liar over it, because it is not that surprising that a system can boot in 8s.