I think this may be solved. The very last step in the instructions (#6) says to set LV_TICK_CUSTOM in lv_conf.h to 1. Which I did not do. After doing so, the touch function started firing off the print statement as expected.
I’m currently trying out a different display without touch, so I’ll need to spend some time to get my other touch display wired back up. As soon as I do and can verify, I’ll report back. But I’m pretty sure things will be working as expected.
Thanks