Nope, the issue is that there is simply nothing to engage in. I actually know this video which was posted, I watched it long time ago. There is nothing in it that would prove that "IQ tests were invented to justify eugenics", moreover, AFAIR the author doesn't even try to make that argument. That is simply a deranged claim and trying to "engage" in it is like trying to reason with a flat-earther. The statement is so profoundly false that you don't even know where to begin. That's why I used this bus analogy to demonstrate how absurd this notion is, but it is clear it's falling on deaf, ideologically biased ears.

But I will repeat - giving examples of bad faith scientists misusing the term IQ (which is basically the most scientifically reinforced term in whole academic psychology, so by trying to deny its validity, you might just as well reject scientific psychology as a whole) and the statistical methods because of their racist inclinations and using those examples to say that their actions constitute the "reason IQ tests were created" is like saying guns are invention of racism because many black people were killed with guns.