When I try to use rvictl with an iPad Air, the tool doesn't error out, but also doesn't indicate success. Here are two invocations first with the udid of an iPhone Mini, which succeeds, and second with an iPad Air, which does not:
~/Desktop via 🐦 v6.0 took 3s
❯ rvictl -s 00008110-[snip]
Starting device 00008110-[snip] [SUCCEEDED] with interface rvi0
~/Desktop via 🐦 v6.0 took 5s
❯ rvictl -s 00008112-[snip]
~/Desktop via 🐦 v6.0 took 3s
❯
If I list interfaces I only see rvi0, which corresponds to the iPhone Mini.