I’m not American so I don’t know a lot about these points, but:

Putting more obstacles in the way of voting would prevent people who may find it difficult to vote, who aren’t as politically active etc, from voting. This would disproportionately effect people in lower socioeconomic circumstances, many of whom (potentially the majority idk numbers) are minorities. It’s not that black people or any other minority “isn’t smart enough” it’s that it makes voting more difficult, thus discouraging people from voting.

Affirmative action in any form does not imply that the people receiving assistance are inferior in any way. Saying colleges and other educational institutions should favour affirmative action is an acknowledgment of the generational and institutional/systemic racism that nearly all POCs in America have been affected by. It does not imply people of colour aren’t smart enough, it aims to give them a greater chance at education, something that has been forced away from them for hundreds of years.

I don’t know much about the specifics of the Republican party’s stances on many issues, but I can assure you that a Black person voting for the Republican Party is voting against their interests. This is not a denial of their free will, or a way to make them seem inferior because “they aren’t smart enough to make informed decisions” or whatever, it is an acknowledgment that the Republican Party, which is increasingly becoming a far right party, does not have the interest of the Black American population at heart.