Not necessarily. It might only be the amount that was settled on, because the labor board wants to do this administratively, and that's the most they can definitively prove.

You know, some wiseass was keeping a diary of his start and stop times, but his three other coworkers didn't and they're left out of this. If they try to go after more, the company will balk, take it to trial and then there's the possibility of much less (or even $0) being the payout.

Or it might only be what they can reasonably be expected to pay. What if they owe three quarters of a million, but there are no recoverable funds to pay that out? What if the restaurant goes tits up, and all those workers are out of a job permanently?

Unless it's handed down by jury and judge, it's probably negotiated.