As an ESL I can tell you that it also depends on your exposure to English. Non-native English speakers are often taught and exposed to mostly (classical) literary works and/or formal speak (for example, math and science). It's one of the reasons why their speech might sound stilted in person, but "perfect" in writing. What you think is "colloquial and limited" might be considered "perfect native speak" by the ESLs who often don't get that kind of environmental exposure to English.
brmgb|7 years ago
Is that in common usage ? I have never seen it used to designate a group of people.
BiancaDelRio|7 years ago
I believe so.
I picked up this usage (ESL as a descriptor of person) from forums and boards around the internet. Not sure how correct it is.