That would make sense, but it doesn't happen. When they catch them it's more or less luck in spotting the obscured plate, and the reflective paint would never be seen by the naked eye of a cop.

https://www.nj.com/news/2022/03/port-authority-cops-nab-driver-they-say-used-a-black-out-device-to-beat-holland-tunnel-toll.html?_sp=0ae2c46a-0e18-4fd7-a85c-6b21a6614e25.1671499168559