This post is a bit of an experiment; Most of the time, Discussion post lay out an idea and this idea then get commented upon. This post, on the other hand, will be purely about discussion on a topic. If this works out well, I'll might post more of these in the future.
On to the meat of this post:
I got this idea from a reddit post on /r/LessWrong.
To quote:
I remember my sociology textbook explaining that sports often show what a group values. Bowling was popular with machinists and factory workers who valued repeated precision, while American football was watched and played by a culture that valued extreme specialization of individuals, but able
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They mean the language used by the majority of where they live, not the language used in the group. Even if all the members are native English speakers, this is still some way of keeping plausible deniability in terms of location.
Edit: reading the OP more cautiously, I think it's unlikely the group lives in a place where English isn't the majority language so the phrasing is vague for not reason. Plausible deniability went out of the window given all the information available.