Where do you see that? I couldn't find it.

It's in the URL :D But yeah, the page doesn't make it clear (and some of the embedded JS has a 2020 date suggesting it's received updates).

In the RSS feed too: Wed, 07 Dec 2016 https://kennyballou.com/index.xml

Hidden in plain view! Ok, let's put 2016 above, on the assumption that the edits since then haven't been too major.