Let's set the record straight.
Here are the official rules:
V. Dress Code
Dress-type shirt (with or without a collar) or a dress-type sweater
Dress slacks; no sweat pants, warm-up pants, jogging pants, cargo pants, or jeans
Dark shoes or dark-colored tennis or walking-type shoes; no white or light colored soles; no sandals, slippers or open-toed shoes
No headphones, earphones, earplugs, iPod, Bluetooth devices, hats, caps, or headgear Hearing aids are permitted.
Note: Any dress code exception to the above requires a medical doctor’s note and must be approved by the Tournament Director prior to the Tournament.
I asked Earl to remove his earplugs and he did.
The rules you are quoting are outdated from several years ago copied from the US Open 9-Ball Facebook page, which hasn't been properly updated. The official rules were printed and handed out to every player at the players' meeting and in their information packet. Furthermore, this rule has been in effect for at least the last three years, ever since the proliferation of Bluetooth earpieces. They are not allowed because we have a shot clock and the players have to be able to hear when I give them a time extension, or a 10-second warning, or a foul.