GTA old school Hits Mission

Is this the only new mission? I thought there were supposed to be three missions, each dedicated to one of the three classic GTA titles—or is it just this single mission where all three of the old games have been bundled together?

I’m not all that familiar with the older installments, aside from San Andreas; I did play GTA 4 and the others a bit back in the day, but I was still relatively young at the time, so I don't really have any clear memories of them anymore. 😅