[vatican_banker]

These companies are, most likely, targeting talent from China, South Korea, or South East Asia.

Top talent from, say, Vietnam already speaks good English and many would jump to the opportunity to work in Japan under these conditions.

[midoridensha]

It's true; I have many more coworkers from China (+SE Asia) than from America. There's tons of IT professionals from China living in Tokyo.

I haven't met too many Vietnamese though, but I have met a couple. Japan also attracts a lot of Filipinos (though not so much in the IT sector, in my experience).