Not quite
You need space in between and the landing area is supposed to be 1.3mm
long plus spacing to the next part.
But he said, "There are 1mm x 1mm 2-resistor networks. No leftovers.", which
is the point. Two-resistor 0402 arrays *are* 1mm x 1mm. No, I guess you
can't put them on a 1mmx1mm board. ;-)
Using many resistors is also an
issue in some apps because they are only rated 50V. Tough this is not an
aircraft project so we may be ok.
Depending on the circuit, voltage may not be an issue. You're being quite
secretive so it's pretty hard to help with the details. OTOH, I often get
specs like this. Then when things don't turn out as _they_ later decide they
should, such complaints aren't uncommon. ;-)