This transaction spends from a transaction that used the old format for spending. The old format was pay-to-pubkey so the public key was already stated in the output the input references. Since the input references an output and that output has the necessary information to determine an address, it is not necessary to have the public key anywhere, all you need to do is look at the referenced output to get the input address. Additionally, the input address isn't actually gotten from any public key in the input. Rather that address is retrieved by checking the specified output since there are special p2sh addresses that exist that don't even use public keys anywhere in them.