The 2017-18 admission rate was 56%. (I think the 2016-17 admission rate was 53%, but I didn’t take the time to look it up.) It’s pretty easy to verify this stuff if you just go to any college’s common data set and do the calculation. Here’s UA’s most recent one:
Unless you have some proof that UA is misreporting their admission stats, you should really stop making unsubstantiated claims. For some reason, you believe you know better how to run the university than their administration does. They were just designated a top doctoral research university by the Carnegie Foundation, so clearly they’re doing something right.