No, those are Goldline calipers which have 4 pistons, but two pads per caliper. They come in 40mm and 65 mm mounting.
40mm calipers have one pin holding the pads, in the middle:
You can also see that the two mounting points are at the "back" of the caliper.
65mm calipers use two pins, one over each piston:
You can see that the mounting points are much further apart.
P4 calipers only come in 65mm mounting but use 4 pads per caliper:
For all three type above, the bolts that hold them into the fork are fitted sideways in - ie, laterally mounted. The problem with this is that braking forces are applied over a very restricted area, the point between the mounting bolt in the fork and the bolt in the caliper itself. This can cause flexing if the load exceeds the amount of force that this area can carry.
Radial calipers are mounted radially - that is that the bolts go through the caliper and into the fork bottom in a radial arrangement. This helps to spread the load over a great area, ie, the full length of the bolt, as the force is now aligned with the bolt rather than in a shearing pattern. Thus radially mounting calipers are stronger, flex less and look more trick...
This is a radial caliper - note how the bolts don't go in sideways...
