Nothing needs to be changed because it’s not a responsiveness problem. The font is tiny because the page was designed for a far wider screen than a phone. A little css could fix it: collapse the two columns of links into one when on a narrow screen.
Sure, that's how to fix the BRK site.
But I was replying to your comment:
> I want to make websites like this and run into the same problem every time: phones exist now.
If you start from unstyled HTML it works. My question is what are you adding in your development process of making simple websites that breaks it for phones?