From previously posted tidal charts the river was ebbing, so indeed they landed with the current, however I don't think that it was intentional. First of all if they thought/knew that they could not make Teterboro (sp?) surely a 180 wasn't an option. Also the river goes both ways, so it just happened to be flowing out at that moment. It just as easily could have been going the other way. There is no way that they had time or means to find out.
IIRC - the river runs about 4-5 kts. Someone said earlier about 10, but I think that is too high.
Someone posted earlier that there was about 10 kts of tail wind.