Yes, that's wrong. Note that the total number of pins is 160. There are only 80 pins on each side of the module, so it must be a DIMM with distinct connections on front and back.
Second, that's that the cache for the 7200 and x500 family, which is different from the cache for the x100 family, so it isn't the cache in question.
But really, Apple just had a brain fart there. They didn't make any 160 pin wide SIMM sockets. That puppy goes in an 80 pin wide DIMM socket.