The attendance at CPC is irrelevant, though by my count there have been 7 men's games to top 4,000 and seven of the top ten attended men's basketball games have come since CPC opened. The last three years are in the top five average attended seasons in UTA men's basketball history. And it is directly because of CPC.
The problem with College Park is something I said in another thread years ago, I looked for it, but couldn't find it (I remember arguing with 80sAlum about Levitt Pavilion). You can't build an area around an entertainment venue that is active at nights at sporadic times of the year. Most restaurants are opened 365 days a year and these entertainment venues see at most 100 active nights a year, with occasional day things. In vibrant areas there are draws at all hours of the day, most (usually all) days of the week.
The article really touched on some issues that are suppressing activity during the day, like the dorms requiring residents to buy the dining option at University Hall. But, the area has to develop organically and for decades, the City neglected its urban core. There has to be far more residential units and office space in the downtown area, and it almost has to be within 1/4 to 1/2 mile of CP to make it work. Without active human presence, it compounds the issue.
Finally, I think there are too many parking issues that compound the presence of dead zones. While I do like the ground floor retail occupying the base of the garage, there are too many dead zones and pedestrian conflict points to create a free-flowing, contiguous pedestrian experience. The garage also funnels much of the pedestrian activity into the interior, instead of on the streets, which is another reason why the restaurants have struggled. Many who do use the garages never walk by the retail spaces.