If they actually expect anyone (well...TOS fans at least) to believe that OldSpock and Nero came from the Trekverse that we know and love, then they should have at least made some effort to connect it to the original.
Which they did. Including dialogue lifted directly from TWOK/TSFS and a character arc lifted from TNG, among many other things such as references to events first described in TOS episodes. In fact, the original deal was apparently something like "No Nimoy, no film". (Of course, that was clearly
an attempt to generate viewers' interest through the appearance of an alternate Spock which they'd never heard of or cared about before, rather than the one they were already familiar with.