This is just a new (and primarily conservative) interpretation of the system (the so-called "unitary executive" theory).
There's a different interpretation where the existing laws constrain the executive, there is no "unitary executive", and the result is a highly constrained presidency. E.g. Biden attempting to use explicit language written by Congress to do something and being told he could not do so by the judiciary (for "reasons").
There's a different interpretation where the existing laws constrain the executive, there is no "unitary executive", and the result is a highly constrained presidency. E.g. Biden attempting to use explicit language written by Congress to do something and being told he could not do so by the judiciary (for "reasons").