It's "cool" but in terms of usability I think it's terrible. I would think that someone who works full time as a designer and has strong opinions on right and wrong would think twice about wasting screen real estate on mobile devices with a bunch of bullshit like a sticky menu, footer and comically huge "window"-headers.

The only thing I see is the design equivalent of over-engineering a car with bells and whistles that nobody gives a shit about, it's simply showing off and sending a signal to other designers, which is obviously fine if that's what you're going for, but personally I hate it (as you may suspect, my job is not in design).

It is unique and looks cool.

When it comes to providing an enjoyable blog post reading experience, it really does creep into the "fuck off" territory for me, though.

Yeah! It's unique, has a personal charm and also everything seems to fit together nicely. Fun to discover such pages, reminds me of the old days, haha!

Not a fan personally, but I do recognize its uniqueness and would love to see more pearls like these!