That is pretty funny, I wrote the code for that blacklist like 5-6 years ago when Thumbtack was being hammered with spam requests from China and India. I thought it only blocked POST requests, though maybe my memory is wrong or they have made the block more expansive in the meantime.
Anyways there is a version or ABBA usable on github or you can always get the source and run it locally:
Re:ABBA: A/B Test (Split Test) Calculator
by harisenbon on Thursday June 23, 2016 @02:39AM
(#11959253)
It's probably a cloudflare instance that they're running on top of the page. CloudFlare's default protection scheme is pretty harsh to non US/European users.
I've gotten blocked from a couple of sites I was managing because I was in Japan.
"Sorry, this request is coming from a country which we currently do not support. If you feel this is in error, please contact our support team by emailing [email protected]."
I guess even blogs and articles are now coming under region protection.