What happens to the initial mass estimate of a magnetar if its magnetic field acts as a temporary support beam?

It might be slightly below the theoretical non-magnetized TOV limit, but the added magnetic pressure stabilizes it temporarily

The extreme magnetic field within a magnetar provides an outward pressure component that partially counteracts the crushing force of gravity. This means that a magnetar whose physical mass is theoretically slightly under the established TOV limit for a non-magnetized neutron star can remain stable as long as the magnetic field is strong. The field acts as a temporary structural reinforcement. If this magnetic support system rapidly decays, the outward pressure vanishes instantly, rendering the star effectively heavier than the TOV limit for its composition, thus triggering an immediate gravitational collapse into a black hole even without any external mass gain.