A US B1/B2 Visitor Visa will generally get you into an additional dozen or so countries (sometimes more), as outlined here: https://en.wikipedia.org/wiki/Visa_policy_of_the_United_Stat... (see "Use for other countries" section). This list crucially includes Turkey, which the author could have used for applying for an EU visa from Istanbul instead of going home.
Not to mention that the US Visitor Visa will let you visit the US for up to 6 months at a time for the next 10 years for a reasonably modest fee of ~$200. Also unlike other countries you don't need to document a plan to visit the US and your visa remains valid even if your passport expires and you get a new passport.
Given all this, I'm not sure why the author hasn't made this (relatively) small investment.
If you're opposed to getting a US visa for ethical reason, you can also pull off the same (albeit to a lesser degree) via a Canadian/British/Schengen visitor visa (roughly in that order).