Adding rides allow the people who show up to do more rides. That is if attendance remains the same. That's a simple mathematical fact.
The problem is that more rides are likely to draw in more people. And if a brand new E-Ticket draws in more people than it can go through in one day, then it has only made the overcrowding worse.
And that is a different metric than the feeling of over-crowdedness where you want to pull people off the streets so that infrastructure isn't overwhelmed. If the ride has a long queue and the ride can 'hold' lots of people, then it pulls them 'off the streets' and the park feels less crowded. That is, until the fireworks show, and then all the extra people that showed up for the new ride try to pack themselves into an already-full Hub.