Can you post the sources you're relying on here? I want to read more on this.
There is also no measured connection between being an introvert and having low testosterone.
And in fact around 2/3 of all psychological research cannot be reproduced. Take any psychological claim with a giant pinch of salt.
1, 3 and 5 feel like super common sense to me, were you asking for sources on that? I'm asking mostly because I wonder whether my intuition is completely off when it comes to these things, or if there are people who live in completely different realities where women are expected to make the first step, more women approach men than the opposite and men really don't need to signal interest because they get so many offers.
Introverted women probably get hit on more ("more offers"), but using that to conclude that they see better outcomes is like saying it's a good thing that my dating life is successful because my inbox is filled with unsolicited dick pics.
If you're unemployed and you get an offer a week, you're better off than if you didn't get any offers, even if those offers aren't great. Options > no options.
I'm an introverted man and all 4 women that have hit on me in my lifetime have been those I didn't feel similarly about. I imagine the ratio for women is similar. Just because she can jump back into the sea, doesn't mean she can summon new types of fish.
*women tending to date men older than them and vice versa does mean that in an increasing population there might be more women in a particular dating pool than men than one would otherwise expect, but there might be negative feedback in the form of more pressure for age-reverse relationships to take up the slack
In my experience, women absolutely have an easier time getting partners, and there's no contradiction. It's just that a few men are taking all the girls - always been this way (notice how many places used to even enshrine that in law by allowing marriages between one man and multiple women - quite a few countries to this day) and probably will never change.
Introverted men, on the other hand, often just don't pursue women, especially if they have low testosterone (or sex drive) as the OP probably does. Since in most cultures men are expected to do the initial approach, this can translate into very long spells (decades or more) of singleness for them. Even worse, introverted men are often very bad at reading women's signals. Those are often quite subtle, because for extroverted men interested in dating (the majority), women just don't need to signal that much to get results.