The only place where I saw that term was an western anarchist take that’s so bad, it’s hilarious. Apparently, “anarcho-tankies” are anarchists who are actually concerned about getting things done and not unquestioningly accepting western propaganda. (Honestly, that’s what to be expected of Raddle. I avoid that place, but someone posted a link on the dev instance, and I was too curious not to click… If you want to laugh and/or cry at it too, see: https://web.archive.org/web/20200903171225/https://raddle.me/f/Anarchism/117740/the-disturbing-trend-of-anarcho-tankies-we-ve-been-seeing).