Is "Ahlan wa Marhaban" sufficient as a response to the greeting?

The Shaykh : If a person says "As-salamu alaykum," you should say "Wa alaykum as-salam." However, "Ahlan wa Marhaban" is not sufficient. Whoever responds with "Ahlan wa Marhaban" is sinful because he has not fulfilled the obligatory duty. If you see someone doing this, advise him. Tell him, "Respond to the greeting. Respond to the greeting." The one who says "As-salamu alaykum" and receives "Ahlan wa Marhaban"