This page looks quite simple, just plain text and a few photos. why does it render so tiny on an iPhone then?
A lot of older websites will look like this on a phone, because they don't have the viewport meta tag, which wasn't a thing until mobile phones became sophisticated web browsers.
Firefox reader mode will probably render it OK.
<meta name="viewport" content="width=device-width, initial-scale=1">
Not sure why we need to add that but mobile sites look like ass without it.(Or more precisely, not sure why "make the site look like ass" was chosen as the default, and making it look good is opt-in!)
I'd rather this than what I often see nowadays: sites with fixed width tables that overflow out of the mobile viewport with no way to view the info.
EDIT: I just checked. There are 77 HTML errors and warnings alone.