Our troops did not lose the war on the ground. In fact we decimated the VC and NV and they were no longer able to field an effective combat force - which is why they signed the peace accord in 1973. Our combat troops left in orderly fashion and under no duress.
The “loss” occurred some two years later in 1975, after we left, due in large part to the actions of the communist-enablers and various other opportunists serving in the U.S. government. Most clearly, it was a political loss not at all due to the conduct of our military force.
The “panicked final pullout” he refers to was also somewhat orderly, at least on the part of the U.S. - it was as hurried as that of any embassy staff facing the approach of hostile combat troops, and because of the U.S. effort to evacuate as many SV personnel as possible.
I was drafted during the Vietman War. I blamed then and now our cowardly Congress for not declaring it what it was -a war, not a “conflict”. I also blame the media and Cronkite for his hysteria after our complete victory during Tet. I believe later the commanding general for the enemy said he was surprised that we withdrew after such a victory. The media was lying to us even then.