A lot of people are convinced Ico talks an old dialect of Japanese and many are quick to believe them since it sounds plausible enough. Hell, someone I know thought the creatures in LocoRoco spoke a real language 
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I heard that it was
backwards Japanese, with the occasional bit of Latin. You know, just so that nobody can really refute the latest silly rumour without going to a lot of trouble. I never believed it even for a second. I doubt that any real thought went into the language at all.
I'm surprised these rumours can persist in the face of official denial such as that interview, though.
Jam it back in, in the dark.