Rear is adjustable by rear track rods for camber and toe combined. It is a compromise, but should also give a zero thrust angle. Not sure he'll get that correct with just four wheel alignment. (Thrust angle means the rear axle is pushing the car dead ahead. If it's not right the car will crab, and the steering wheel will never be straight/level even if the front figures are correct)
Toe is -0,10 combined, so 0.05 per side, +/-0.05. A parallel setting on oe bushes is not ideal as it can allow toe out under breaking leading to instability.
Target camber is -1.10 for a standard car. -1.15 for sports suspension IF the evident tyre wear warrants it. Sorry but -1.20 is too much under any condition.
Castor is not adjustable, officially. BUT the correct angle can be achieved by moving subframe first. Then camber, then toe last.
While four wheel alignment may not be idea, it's probably better than nothing. Given the work done, provided he's accurate with the figures.