On-the-wire corruption is exceedingly rare. Over-the-air corruption is considerably less rare.
But wifi corruption is detected and corrected. (wifi unicast)
I consider wifi unicast as a guaranteed delivery for packets if the connection is not dropped. There is a checksum per MSDU. If not acked, in MT it is retried 7 times at the same interface rate, if still not acked, MT will lower the interface rate and try again 7 times. If at the lowest rate (6Mbps) already and still not acked, MT will retry for the “disconnect timeout” time (default=3 sec) , every “On fail retry time” (default=100msec). If it still fails then “disconnect excessive errors” will occur, and packet and connection is dropped.
The “Frame Lifetime” timeout could drop the packet. (but this is disabled by default)
See “What is HW retries setting” and “How to fine-tune the wireless link with hw-retries?” in https://help.mikrotik.com/docs/display/ROS/Wireless+Troubleshooting
Rising the basic rate, for wifi multicast, has no such checksum-check and retransmit, and will indeed still give problems for IPTV packets missing or corruptions.