Denial of a pillar of islam

Assalamu alaykum, Let's imagine that a Muslim denies a pillar of Islam that he knows to be true, then he becomes a disbeliever. Then, let's imagine that this person pronounces the shahada with sincerity. Is this enough to make him a Muslim again, even if : - he hasn't repented - and he hasn't reaffirmed either verbally or in his heart the pillar he denied. However, he knows in his heart that the pillar is true and he no longer denies this certainty