Probably is. Two thoughts on this.
1. If everyone is tested so often, why do coaches need masks? They aren't any more likely to transmit or contract Covid than players. If players are safe to play, coaches should be safe to coach without a mask. At this point it is just about appearances and not at all about safety for them. (Off the field is obviously different)
2. The issue with the masks seems to be communication, especially on their headset. Why not just go full helmet with a built in microphone then? Just for fun, maybe a Darth Vader helmet for Halloween.