Half of it. He also describes some preparations he did while in the destination and a final test on a flight back.

Yep; on my way to LHR I was intrigued by their "free messaging" and wanted to poke around, with the SNI hypothesis I did the actual HTTPS proxy setup on a VPS while in the UK, so I could actually try and proxy arbitrary browser traffic on the way back

I am insanely productive on airplanes, I'm sure others are the same.

He wrote at the end he hoped his idea and all preparations will work, because he wouldn't be able to repeat the steps while in-flight.