Types of Hajj rituals, is ifrad permissible in Hajj, and is 'Umrah obligatory in Hajj?

The Shaykh : From this, we know that Hajj has three types: tamattu', qiran, and ifrad. It is obligatory for us to know that the individual Hajj (ifrad) is not permissible for a Muslim to intend in his Hajj; rather, he must turn his attention away from it. This is because it is established from the Prophet (peace and blessings be upon him) in the well-known story of the Farewell Pilgrimage that he addressed them after he had walked between al-Safa and al-Marwah. He stood on al-Marwah and stood among them as a preacher, and among what he said was: and he interlaced his fingers like this.
This text means that it is not permissible for a Muslim to perform Hajj without 'Umrah; because 'Umrah has entered into Hajj until the Day of Resurrection. That is, our Lord (Mighty and Majestic) made 'Umrah in Hajj part of Hajj. This text indicates that 'Umrah in Hajj is an inseparable part, meaning it indicates that 'Umrah is a pillar of Hajj. If I did not know that no one has adopted this view, and if I did not know that no one has relied on the apparent indication of this text, I would have said so. But no one has preceded me with this explicit statement. So we say that 'Umrah is obligatory. This text, at the very least, establishes the obligation of 'Umrah in Hajj; because it has become a part of this act of worship. This part may be a pillar of the act of worship, or it may be an obligatory matter that is not a pillar. This is possible. So the least that can be said is that 'Umrah in Hajj is an obligatory matter among the obligations of Hajj. But we cannot say that 'Umrah in Hajj is a pillar of Hajj, meaning that if one leaves out 'Umrah in Hajj, his Hajj is invalid. We cannot say this because we do not know of anyone who has preceded us to that. But many, many of the great scholars, from the Companions and others, have preceded us in saying that 'Umrah in Hajj is obligatory. Therefore, every person who intends to perform Hajj in this year or in the coming years should perform 'Umrah before Hajj in the months of Hajj, so that his Hajj is as he (peace and blessings be upon him) said: .
There is no difference between a pilgrim who performs Hajj for himself or one who performs Hajj on behalf of another. We have heard repeatedly, almost every year, that some of the scholars who have made it a habit to perform a substitute Hajj instead of performing an ifrad Hajj, and they have made it a system. This has become a custom in the minds of some people who have no knowledge and who are unable to seek clarification from those who teach them these issues. It has become a custom with them that a person's Hajj for himself is one thing, and his Hajj for another is another thing. So he performs tamattu' Hajj for himself, but for another, in a substitute Hajj, he performs an ifrad Hajj. This distinction has no basis in the Shari'ah.