One thing that keeps cropping up here is the assumption that Argentine tango somehow transcends local culture wherever it catches on, and has a global existence that penetrates virtually all culture and language barriers. This is a simple assumption that works reasonably well in many places. It probably even holds true for tango festival (including encuentro and marathon) culture worldwide. However, there are exceptions.
I live in a francophone part (Québec) of an otherwise anglophone country (Canada), a region that has a 65+ year history of rejecting the surrounding culture in favor of its own – in dance, literature, music, visual arts, and most other things (right down to beer, cigarettes, and travel destinations). A side effect of this is that when third-culture (i.e., neither native anglophone nor native francophone) phenomena land on the national doorstep, people here make a point of choosing different influences from those chosen by English Canada, and are often contrarians about how those things "should" look when adapted locally.
This is definitely the case for tango! In English Canada, tango largely followed the U.S. trajectory in terms of who was admired, how it was taught, which steps were danced, etc. In Québec, tango was reimagined quite a bit, in part due to an admiration for all things French, particularly ballet, and in part owing to Montréal from 1960 onward taking pride in cocking a snook at Toronto . . . it's a city that thrives on irreverence, which is extremely visible in dance. (More practically, maestros and maestras who speak French always get first billing over those who do not, regardless of pedigree or lineage.)
So, while you can certainly find expat Argentines teaching tango here, you can also find people teaching a more balletic, modernized dance and calling it "tango." The two groups intermingle – you can't pry them apart. Lots of wealthier dancers who travel come back and dance or even teach the more internationalized version, but their dancing definitely isn't seen as "standard" here.
Something to think about.