No, what you see is people debunking his "claims" with the actual facts over and over again going on for eight years now. For which his "mature discussion" response is to simply ignore the actual data and repeat the falsified information ad nauseum.
That is not argumentum ad hominem of any sort. Instead, it is an attempt to counter a serial purveyor of argumentum ad ignorantiam. That methodology is that of Goebbels Propaganda Ministry, Donald Trump, Stormfront, and tabloids, and should have no place here in what purports to be a "research forum". That it is tinged in no little way by extreme frustration by the respondents shouldn't be wondered at, especially given the misplaced adulation he receives from other posters for his deceptive rants.
The only thing I see is hurt egos, people trying to squeeze out every little percentage to make it look as if the WAllies were the be all and end of all things, you are just more academic about it than the others (this is the equivalent of those Wehrmacht fanboys, "if they had produced more Tigers, they would have won", or those Russian ultranationalists, who want to tell us that Talinn, Riga and Kiev are rightfully theirs).
The pinnacle of military effectiveness and the sole saviours of mankind. If this was really the case (and I think Guaporense stated this before), then the WAllies would have been more serious (and comptetent and here he draws a connection beteween WW1 and WW2) about an effective strategy to contain Hitlers expansion earlier (interventions in the 39 campaign or perhaps even before). I understand that some people are a bit more "patriotic" about it, but this, "the GI was superior to everyone" (S.E. Ambrose mentality), is ridiculous.
Everyone in this forum should be able to realize that the EF was the decisive front in the vast Nazi-Soviet conflict. It was the suffereing of the slavic population that stands unprecedented.
The "Free World" was also very hesitant about fighting the Communists. Not only did they sell out the eastern European countries to the Communists, the Americans also woke up pretty late to counteract the aggressive expansion in Asia (with the power vacuum of a destroyed Germany and Japan the USSR could expand unhindered), only when a poor 3rd World country like Korea was being left and overturned.
I do not always agree with Guaporense, he could be a bit more diplomatic about his statements. I do think he slightly diminishes the contributions of some nations but his statements should not be dismissed so hastily, they are based on research. The effectiveness of strategic bombing is still disputed, if anything it was an effective way of killing civilians, but that is what the Nazis were primarily doing in the their wake of destruction anyway. It was retribution.
If anything, his posts have more of a leftist character, not comparable to Goebbels or Trump (and I do not think that mentioning Trump in one sentence with Goebbels is a proper observation).