If the right to life were a natural right, and thus inalienable, murder and suicide wouldn't be a thing. Murder and suicide would be literally physically impossible to accomplish. That life can be taken away proves that the right to life is a civil right, not a natural right.
If the right to liberty were a natural right, and thus inalienable, incarceration and slavery wouldn't be a thing. It would be literally physically impossible to arrest and imprison someone. That liberty can be taken away proves the right to liberty is a civil right, not a natural right.
If the right to property were a natural right, and thus inalienable, theft and damage wouldn't be a thing. It would be literally physically impossible to take anything from anyone, even with their consent. That property can be taken away proves the right to property is a civil right, not a natural right.
Samuel Adams was wrong.