Do the prostrations for forgetfulness suffice for a pillar in the prayer?

Question:
This questioner, Nabil Muhammad Harfush from Riyadh, says: One day during the 'Asr prayer, the imam, in the prostration of the fourth and final rak'ah, performed only one prostration, and no one noticed, assuming that he had performed the two prostrations. After finishing the prayer, one of the worshippers said to the imam: "You are missing a prostration." So the imam performed only the prostrations for forgetfulness, and did not perform the missing prostration. The question, O honorable Shaykh: Is this 'Asr prayer still pending because it is missing a prostration, which is a pillar of the prayer, or is it considered valid? May Allah reward you with good.

Answer:
If the imam remembers that he left out the prostration, he must repeat the prayer, and so must those with him; because the prostrations for forgetfulness do not suffice for the prostration. It is obligatory for him to perform the prostration, then perform the tashahhud, then say the taslim, then prostrate for forgetfulness. And if he prostrates before the taslim, there is no harm; he prostrates for forgetfulness. Some scholars hold that he stands up and performs a complete rak'ah.
But the correct view is that he performs the prostration and that suffices. He returns and performs a prostration, sits and says: "O Allah, forgive me, O Allah, forgive me," then prostrates. Then after the prostration, he recites the tashahhud, then says the taslim, and prostrates for forgetfulness after that. And if he prostrates for forgetfulness before the taslim, there is no harm.

The presenter : May Allah reward you with good.