I don't doubt that FE'ers would take offense at the tone, but he makes many valid points. I'm curious specifically which of his arguments you believe aren't actually FE beliefs.
Just in the first video he says
"The conspiracy dates back to antiquity but is all due to NASA and the UN"
Actually the "conspiracy" is about faking space travel, not the shape of the earth:
https://wiki.tfes.org/The_Conspiracy
So NASA aren't trying to fool you into thinking the earth is round, they think it's round too, they're just faking space travel.
He says that FE is all based on God creating a flat earth with a dome and the entire argument boils down to "But meh Holy Book".
But he then goes on to admit there is some debate amonst flat earthers about whether there is an edge. SOME Flat Earthers do indeed believe what they believe because of a certain (wrong, IMO) interpretation of Scripture, but many on this site do not. Honestly, I don't know what their basis is, seems to be wrapped up in other conspiracy theories.
He states that the FE Map is as shown on the UN Logo - actually there is no agreed map although that is admittedly the one commonly shown.
He states that the UN would stop them exploring Antarctica with patrols the southern seas. Some FErs do seem to believe that there is something actively stopping exploration of Antarctica but it is not a universal FE belief. That is not mentioned here and there is a suggestion of a bi-polar model:
https://wiki.tfes.org/Antarctica
One of the problems with refuding FE is there isn't a coherent flat earth model. There is so much disagreement within the community about their own model it's quite hard knowing what to refute. But in that video series he does make claims for FE Belief which are either wrong or not universally believed within the FE community.
Ok, so you believe NASA is "A" conspiracy, just not "THE" conspiracy. But clearly, you have to believe in another conspiracy since belief in the sun centered solar system started with Copernicus in the 16th century. In our modern times all of science, popular knowledge, school texts, etc. explain this to be correct. FE'ers would have to belief that there is a conspiracy or that every scientist since Copernicus was honestly just wrong. Yes, your FAQ says "conspiracy" just means NASA faking space, but the posts generally talk about how everyone believing in a spinning globe has been fooled. Sorry, that's conspiracy talk.
He says in the FE community some believe in a fixed disc with a dome, and some believe it is infinite. And I have seen comments here from both opinions. So I don't see the objection there.
If you want to see someone tie the image of the UN flag to the flat Earth map, see your own FAQ page where it states: "The United Nations emblem closely resembles the Flat Earth map."
In regards to the UN fleet guarding Antarctica, open a thread asking why FE believers haven't explored to the edge of the world and I am confident you will get a response using that excuse.
I'm sure he does make claims about things that are not "universally believed within the FE community" since there is virtually nothing that is "universally believed within the FE community". Look at the state of "FE theory". The flat Earth is finite, or infinite. There is one pole, or maybe two. Inconsistent diagrams and explanations of how things work, moon phases, eclipses, sunsets, how light travels. Let's look at the map, or wait, there is no agreed map. Let's talk about the distance a plane flies. Well we can't since we don't have a map.
Let's face it. His videos are well done and present many valid points, and your response is basically a way to find complaint about the video in general so that you have an excuse to dismiss it instead of trying to answer any points factually. Because you can't.