I did this trip in my own car this year, from the UK and back.
The article is a bit dishonest about what the highway is like. The majority of the Pamir Highway (the M41) is actually in quite good condition. There are just occasional unpaved stretches, notably the mountain passes and the stretch down to Khorog. The flat bits have good, wide tarmac that you can do 60mph on.
Still - it was a good lesson in being prepared. There are not many people passing by, so you really don't want to be breaking down. Winter was drawing in when we were there, making it extra dicey.
The real adventure is getting off the Pamir Highway. The Wakhan Valley, Zorkul Lake, the Bartang Valley. That is where my best memories are from, and where most of the photos in the article seem to be from.
Apart from the landscapes, my other fond memory is of the Pamiri people. They are such kind, warm people. It is engrained in their culture to care for travellers. When you live in such a hostile environment, you have to look after each other out of necessity.
It was also interesting seeing how their quality of life has changed recently. There is no cell service, and electricity only in the two large towns. But most of the places we visited without electricity now have cheap solar panels from China. The influx of tourism means that everyone runs a homestay and can start to afford things like that.
I have been meaning to write up the trip in more detail. I haven't recorded it particularly well yet. A few photos are on Instagram: https://www.instagram.com/bfirsh/