I've only done a little looking into things.

No, overpopulation is not a legit issue,

I can't believe you actually would say this. I could, maybe, see someone thinking it isn't the biggest issue or that our technological advancements will keep ahead of population growth ... but with this categorical statement you're essentially saying the world can support infinite population.

I don't dispute we have plenty of food for the time being (until impacts of climate change on food supply become more pronounced over the next century. Meanwhile, right now, resources are becoming scarce. The western US hasn't enough water for the people it already has and is just one of many such places. Fishing populations continue to be depleted by overfishing in numerous locations as another example, and so on.

I'm well aware of forced sterilization and it is absolutely horrifying.

But it sounds like you're unable to distinguish between forced sterilization and availability of contraception to be chosen (or not) by individuals voluntarily. These are not the same thing.

The undergrad paper made the same mistake.

Furthermore, though I don't disagree billionaires interested in the birth rates of brown people could be seen as suspicious by you and others, suspicion is not evidence.

Another possible interpretation is that Gates is interested in making contraception available because, as I stated in a prior comment, voluntary family planning reduces poverty, reduces mortality rates for moms and babies, and so on, and I even linked a few studies in a prior comment.

I don't disagree that imperialism is a major issue for many countries and I don't dispute that US foreign policy has royally fucked a number of countries around the globe. I agree that these countries should enjoy liberation and self determination.

But that is all a non sequitur with regard to whether family planning is an evil eugenics plot. Bill Gates isn't the US government or CIA or any of that. It may all feel like it proves something but it doesn't. In a few years we can look at studies of red vs blue states to see what impacts banning abortion has without brining any eugenics into it.

If contraception results in less poverty, lower mortality rates, (it does, as supported by studies, as previously mentioned) and a better economy in these countries it seems to me that it is one of the things poorer, developing nations could benefit from to gain self determination and get the boot off their collective necks.

Finally, in my brief research this far, I've come to find that this whole eugenics thing with Gates is basically Facebook conspiracy nonsense.

Gates is a favorite target of conspiracy nuts aka people with poor epistemological skills.

I will believe whatever theory is best supported by the best evidence. But so far I haven't seen any even minimally acceptable evidence support such claims about Gates.

Contrast to the mountain of good evidence supporting that he is a total asshole in terms of relationships, business, stuff like that.

I'm certainly open to being wrong at any time as I have demonstrated many times in my life.

You don't get to the truth by bending logic and searching for any scrap to support your pet theory. That's conspiratorial, superstitious baloney you see in the movies.

You get to truth by following logic, selecting the best evidence and considering multiple explanations, being self aware about many cognitive biases, and arriving at the explanation that fits best. That is what is required to be "intellectually honest".