Much of what I read in that particular website is the whole 'we didn't lose' reiteration which is seemingly repeated year after year. The US did lose the Vietnam War. You do not win a counterinsurgency conflict by winning battles, which is something some people have a hard time to grasp. I've written a larger post on this topic that you can read right here.

Otherwise, it's filled with some correct answers but even when they are incorrect, they are usually wrongly interpreted out of the sources that this individual had with him. He has a very clear and present bias which is something we should keep in mind.

The author is correct concerning the fact that most men in the Vietnam War were volunteers but omits the fact that most men volunteered to avoid the draft and to have some say in where they ended up. Some men simply volunteered since they saw the draft as inevitable and just wanted to get it over with.

The answer regarding Kim Phuc is also correct. The South Vietnamese Air Force did indeed bomb her village.

Many other of his questions and answers are genuinely up for interpretation. Some of them are downright wrong, like the previously mentioned 'US didn't lose' or the claim that "The ASEAN (Association of Southeast Asian Nations) countries, Philippines, Indonesia, Malaysia, Singapore and Thailand stayed free of Communism because of the U.S. commitment to Vietnam" which is downright absurd. Thailand faced its own insurgency around the same time of the Vietnam War (and beyond), and it was much thanks to refined counterinsurgency strategies that it managed to actually win - as opposed the US.