I agree with you that this is a factual question, but still it’s impossible to ignore the implications of this question. If it turns out that people of type X are much smarter than people of type Y, then naturally we will come to discrimination and exclusion of population Y, and racism will flourish (in practice, not only in feelings). Intelligence is the main component in almost everything in life, and if you give preference to one over the other because of genetic things, the consequences will be disastrous.
Wouldn’t it be better to lie to ourselves so as not to reach that situation?
It is permitted to alter the truth for the sake of peace.

In the past it was the opposite. The Ashkenazim were the primitives and fools, and the Mizrahim were proficient in philosophy, science, and mathematics. It was דווקא the Sephardim, especially in Europe, who maintained education and high status. The problem was that they kept small families and therefore became a relatively small minority among the Jews of Europe. After the Ashkenazim began to become educated, the European Sephardim started assimilating among them quite a bit.
This was part of the decline of the Islamic world. Today the Mizrahim contain a higher percentage of ignorant and primitive people.

Among the Ashkenazim too there were classes. The Jews of Germany and Western Europe were considered more educated, smarter, and more developed. The Jews of Eastern Europe were considered inferior in the eyes of the Western Jews and were called Ostjuden.

Not true. If it turns out that there are differences between the populations, one should acknowledge that honestly. As for the implications, two things should be taken into account: 1. The difference is statistical, but obviously a particular person can be very smart even if he belongs to the “stupid” group. 2. A person’s rights are not connected to his intelligence. The fact that someone is less smart does not mean he deserves different treatment. And if someone is defective and gives him such treatment, then that person should be dealt with, not lied to. Psychometric tests rank people and have implications for admission to university. Is that racism (or intelligence-ism)?

A population that is less intelligent than another population will indeed receive different treatment, because clearly the smarter population will be preferred over the stupider population (just as autistic people have a harder time integrating into society). As for the psychometric exam, I think that’s the reason the Council for Higher Education always makes sure to say and write that the psychometric exam does not test intelligence, but various other things. I have no doubt they are lying and not brave enough to say the truth, but there is something to it, because they too understand that if we say the psychometric exam is meant to test intelligence, the consequences will be disastrous. What I’m basically saying is that I don’t disagree with the Rabbi in principle, and I agree that presumably genetics has significance in these matters, but I think that if we say this truth, we will come to “racism,” because then it will be impossible to accuse me if I prefer to hire an Ashkenazi waiter over a Mizrahi one, since intelligence is such an influential trait that even in banal jobs like waitering it comes into play.

Not true. And if so, then that needs to be dealt with, not lied about. Each person should be examined on his own merits, and if there is no way to check, then stereotypes are a legitimate way of sorting people, and there is nothing racist about that.
The psychometric exam tests certain abilities, and it really doesn’t matter whether you call it intelligence or something else. It is a tool for sorting people.
It seems to me we’ve exhausted the topic.

Thank you very much for the reasoned explanation.
P.S. Does the Rabbi give in-person classes for the general public?

On Zoom. There are WhatsApp groups that you join, and there you get updates and receive materials. See the details here at the top left.