I was curious, so I tried it out.
I ran `apt install offpunk` on my Debian laptop.
Then, I ran "offpunk" and got a new terminal prefixed "ON>".
Curious, I entered "help" and got a list of topics. A few stood out as immediately interesting, so I tried "open https://benovermyer.com" to open my site. It said I needed to "go" somewhere first. So, I tried "go https://benovermyer.com" instead.
That showed me a text preview of my front page, interestingly with content between headers stripped out. OK, that's neat, but now what?
So I now tried "open", and this time it opened the page in my browser, Vivaldi. It was my site, sure enough, but cached locally and missing my main image. All the CSS was intact, though.
That's as far as I've gotten at this point, but it was an interesting enough experience that I thought I would share. It's a very different flow from what I was expecting.