Effective altruism is based on the core belief that all people count equally. We unequivocally condemn Nick Bostrom’s recklessly flawed and reprehensible words. We reject this unacceptable racist language, and the callous discussion of ideas that can and have harmed Black people. It is fundamentally inconsistent with our mission of building an inclusive and welcoming community.
— The Centre for Effective Altruism
Equality is always “equality with respect to what”. In one sense giving a begger a hundred dollars and giving a billionaire a hundred dollars is treating them equally, but only with respect to money. With respect to the important, fundamental things (improvement in wellbeing) the two are very unequal. I take it that the natural reading of “equal” is “equal with respect to what matters”, as otherwise it is trivial to point out some way in which any possible treatment of beings that differ in some respect must be unequal in some way (either you treat the two unequally with respect to money, or with respect to welfare for instance).
The most radical view of equality of this sort, is that for any being for whom what matters can to some extent matter to them, one ought to treat them equally with respect to it, this is for instance the view of people like Singer, Bentham, and Sidgwick (yes, including non-human animals, which is my view as well). It is also, if not universally at least to a greater degree than average, one of the cornerstones of the philosophy and culture of Effective Altruism, it is also the reading implied by the post linked in that part of the statement.
Even if you disagree with some of the extreme applications of the principle, race is easy mode for this. Virtually everyone today agrees with equality in this case, so given what a unique cornerstone of EA philosophy this type of equality is in general, in cases where it seems that people are being treated with callousness and disrespect based on their race, it makes sense to reiterate it, it is an especially worrying sign for us. Again, you might disagree that Bostrom is failing to apply equal respect of this sort, or that this use of the word equality is not how you usually think of it, but I find it suspicious that so many people are boosting your comment given how common, even mundane a statement in EA philosophy ones like this are, and that the statement links directly to a page explaining it on the main EA website.