Canon Pixma TR7520 offline on Mac Mini, missing driver

You should not need drivers to use that Canon AirPrint compatible printer.

About AirPrint - Apple Support

1) Cycle the Canon printers power.

2) Make sure it is connected to your local Wi-Fi network.

3) Restart the Mac mini and then reset the Mac mini's Printing System.

Reset the printing system on your Mac to solve a problem - Apple Support

If you need the IJ Scan Utility or Wi-Fi Assistant, go to the Canon web site.

https://www.usa.canon.com/support/p/pixma-tr7520?srsltid=AfmBOor2HEH1lojynon-wn9SDKpB9tKnyJPLRkh3GITM9cw_j2rkys2S

Apple does not supply printer drivers, that comes from the printer manufacturers. One thing you should try prior to going to Canon is first try resetting the printing system per Apple's directions in Reset the printing system on your Mac to solve a problem - Apple Support

After resetting the printing system restart the computer and then attempt to add the printer.

Canon released updated printer firmware in September 2025. Is that loaded here? If not, update the printer.

Page 182 has firmware update info.

https://downloads.canon.com/hsg2023/ijprinters/manuals/TR7500ser_OnlineManual_Mac_EN_V02.pdf

Here’s some better firmware update doc:

https://support.usa.canon.com/kb/s/article/ART172096