I'm fairly confident that's never been said. I follow the interviews pretty close.
Are you saying NES and Famicom are two different things?
Yes I am. The NES stands for Nintendo Entertainment System. The Famicom stands for Family Computer. Regardless of the fact that they are both pretty much the same system, they have a different physical apparence, many pieces of different hardware/equipment, the games aren't interchangeable, and they have many of their own games for that matter. It's not like how modern day systems just get released in different regions, the NES was designed specifically to cater to western audiences based off the earlier released Famicom.
In any case weather you agree with me or not on that subject, the fact still remains that because FF1 wasn't released outside of Japan until at least 1990, he wasn't playing it in 1987.
That sort of thing was pretty unheard of back then considering we didn't have the internet. It would be pretty rare to even know FF existed in Japan before it was released here. Even if he did, you wouldn't have been able to hook it up to most TV's back then as it used video input cables instead of coaxial cable, and in addition to that you wouldn't even be able to plug it into the wall in your house with out a converter.
We can go into some other wild explanations like he lived in Japan and speaks Japanese (doubtful), or he has a time machine, or ancient aliens, but those all seem to venture into the realm of convenient excuses imo.
All of you hop on over to Rien's translation page and read the part where Yoshi says flat out in a Japanese interview that it would be asking too much of his staff to have it released before the end of January. So yeah, March is prob the soonest.