Diki, you can call it any thing your little heart desires.

If it will help you cope, you can call it an arranger...I don't mind, and I'm sure Yamaha doesn't mind either.

Yamaha calls it a digital piano, and/or a piano with arranger features, and that's what I'll call it when demoing.
I don't think it will be any serious competition for your old G-70.

Now, if this product had another wheel, and the guts of the S910, it would be quite the piano based arranger (or whatever you want to call it)...betcha it wouldn't be much heavier than an S910.
How unfortunate that Yamaha's market research shows very little demand for a 76 note MOTL/TOTL arranger, but if that should change, it appears they do have the components available.
Ian