It's one thing - one correct and good thing - to specify an ethical framework that says all people are of equal intrinsic moral value, and therefore have equal rights as human beings. It's another incorrect and bad thing to deny reality and specify a factual framework that demands that all people be claimed to be scientifically indistinguishable, having no identifiable characteristics that differ along social groupings.
Point 1, that they can deny "Content that is premised upon the assumption of inherent biological, social, or cultural superiority or inferiority of one human group over another based on race, ethnicity, national or social origin, sex, gender identity, sexual orientation, religion, political or other beliefs, age, disease, (dis)ability, or other socially constructed or socially relevant groupings (hereafter referred to as socially constructed or socially relevant human groupings)." is pretty hard to disagree with. Such content is morally wrong and should not be published, can't we just agree to treat everyone with respect?
On the other hand, Point 2 is qualitatively different, in that rather than considering the immoral and subjective value judgements that may motivate some researchers, it calls into question the objective factual truths that some researchers are allowed to uncover: It says they can deny "Content that undermines — or could reasonably be perceived to undermine — the rights and dignities of an individual or human group on the basis of socially constructed or socially relevant human groupings." This is a prohibition on publishing facts that some people may abuse to justify their abhorrent moral position.
For example, as a tall Dutchman, it's a fact that I'm able to reach things on shelves that my shorter coworkers cannot reach without assistance. At our office, we have a few freakishly tall Dutch guys, and some shorter Hispanic women. If, hypothetically, you did a study of the time it takes us to dry and put away dishes in the break room, you'll observe that Thais needs to move a stepstool around to put away mugs on the top shelf, taking significantly more time, and that Dave and I can touch the ceiling flat-footed and need no such aid, so we Dutchmen can complete the task faster. To be very clear - that's a fact, not a value judgement! It should not be misconstrued to undermine the position that men have equal value to women, or to suggest that Hollanders deserve more rights than Columbians! That's ridiculous and wrong!
It is unfortunate that there are some people with a morally abhorrent worldview who will seek to use factual differences to justify their cruel behavior. But prohibiting the dissemination of those facts does not make the fact disappear or become untrue, it only makes the prohibitors look foolish and makes the study of those differences the exclusive domain of the discriminatory people.