We know today that biological structures are at the nanoscale floppy and wiggle frantically.
This is the reason why even with very advanced technology they cannot be directly assembled in place by nanorobotics.
What may be possible in the not so near future is to preproduce the necessary molecules and place them appropriately at very low temperatures.

Food is the hardest to synthesize and the cheapest product by mass since it's already self replicative.
So it's questionable wether it makes sense to synthesize just copies of existing food.
Creating novel luxury food is another story.

What we really want are productive nanosystems aka atomically precise manufacturing systems as outlined in the technical book Nanosystems.
There is no way this is what they are talking about here.

Taking a wild guess (which is probably wrong)
what they may have could be a MEMS printer with a lot of material cartridges.
Such a printer would not be able to replicate itself (specifically the nozzles).
How far you could get to the appearant shape smell and consistency of a pear with that kind of system I don't know.

One must concede them to have coosen a clever advertisment.
It will draw tremendous attention.