This device doesn't make it easier to catch speeders, what it does is give a way for habitual speeders to stop speeding. The primary goal is no doubt that these people will simply stop breaking the law now that there's a device there helping them do that without the need for further law enforcement. To the extent that fails though, it's a measure which makes it reasonable to increase penalties and thus increase the level of deterrence.

Increasing penalties for speeding without this device has issues. It's basically impossible to prove that you intended to break the law, and that you didn't just misjudge your speed. Worse there's become a culture of mildly breaking the law, and it's even harder to prove you intentionally went beyond what's acceptable in that culture. There's a reasonable doubt that it was a honest mistake. This makes it politically, legally, and morally problematic to have significant penalties attached to speeding.

But if you're caught speeding because you disabled the device that a court ordered installed to prevent you from speeding, all worries about intent go out the window. It is, beyond a reasonable doubt, a deliberate violation of the law. Not the actions of a well intentioned person who was in a hurry and bad at judging their speed. This means that, relative to speeding, penalties can be significant increased resulting in better deterrence.

Specifically it looks like Virginia's new law makes it a "class 1 misdemeanor", which is the harshest class of misdemeanor in Virginia law, and the same as a DWI or simple assault. Sentencing maximums are a bit deceptive because they typically aren't what are assigned, but theoretically punishable by up to a year of confinement.