An OEM diesel-powered 4Runner is very possible... just not in North America, and not 5th gen. I'm guessing it's too late in this generation for a new engine release; if it were planned for 5th gen it would have come with the mid-gen-update in 2014.
They make Taco's with diesels right now; it's just that they aren't selling them here. If Tacos with diesels start selling in North America, then maybe a diesel 4Runner might follow a few years later.
As for poor wording, that's obviously just a bad translation of something originally written in another language. So theoretically it's possible it was written about a diesel 4Runner to be released in Latin America or China.