Well the fact that the insects can breed with human females suggests that there's some unconventional biology at play here. Not a biology expert so could be wrong, but I believe just about all insects lay eggs. These eggs provide the nutrients for the baby until it can hatch.
Mingaru insects are live birth in a nearly fully grown state. As show in some xrays, they go through the larval state while inside the womb. Also these insects seemingly have no human genes at all. They could be a special breed where the sperm can take over a human egg and trick the female into thinking it's raising a human baby and set up an umbilical cord to feed it.
Lots of explanations are possible when insect sperm can fertilize a human egg to create a fully insect baby.>>9718927
That sucks, I guess you could try getting a VPN to confirm if that's an option for you. Though I believe blocked websites should show an error connecting rather than just a blank screen.
In the unlikely case you've never cleared your cookies for months, try doing that. Exhentai keeps a cookie which prevents site access if the initial visit was done while not logged in.