It is an old phrase* but in this case means seen in normal consumer purchasing locations, not given to reviewers, developers, seen from Nintendo's development labs...what exactly does "out in the wild" mean? Where is the wild? So far only someone in ASIA had one, right? Is there anyone, who had this issue with a switch bought in Europe or Americas?
Yes it seems to be Asia/Japan only at this point, however the Switch has not exactly been sitting on shelves in a lot of the world and all the Switches are the same everywhere in the world (no special Japan only model like you might have seen for the NES or SNES or something) so it would be fair to assume they will start to appear in Europe, the US and wherever else before too long.
I don't know when that will be, and while there are a lot of places replacing stock of Switches there are also others that might have them for many months before selling it.
*originally it was probably to do with animals and plants ( https://www.google.com/search?q="in...UvKusrAH&start=10&sa=N&biw=1920&bih=879&dpr=1 has some examples from around 1800 ). Or if you prefer then I go walking in the country (the wilderness) here I am not going to see an elephant as I am in the UK, however if I go to a zoo or something I might well be able to see one. That would not be in its natural habitat aka the wilderness aka in the wild though.