Yes, the pins are at 2 at each 1/3 of a circle, but rotates twice for a complete combustion cycle.
The L4s have to be, 720° ÷ 4 = 180° .

w/r/t "the shop spun the crank with no bob weight on it"
That's where I get nervous.
If the reciprocating weight is zero-ed out by the other piston doing the same thing that only means that no compensation is needed for the piston, rings, pin, and rod small end.
But... isn't the rod big end still rotating weight, which the counterweight must oppose?
If not, the crank has been "balance factored" (including only some of the weight) like a V8... by accident.

Eeek!