Yes, I don't think any of the Revisionists I read would have claimed that nothing happened. Certainly, there was a brutal ethnic cleansing that wiped out the eastern European Jewish community as such, and many Jews died as a consequence. The Revisionists weren't so much disputing the suffering of the victims, as they were rejecting the maximalist demonization of the Germans or Nazis. They would also agree with you about the lopsidedness of focusing so exclusively on the Jews, to the exclusion of the tens of millions of other people who died in that war.
The "classical" Holocaust narrative solidified in the early 1960s as a three-part assertion: 1) Hitler and his government had a plan and a policy to physically exterminate the Jews; 2) The primary means of this extermination was mass gassing in homocidal gas chambers; and 3) The total number of Jews killed was about six million, including about four million in gas chambers.
The Revisionists counter that: 1) There was never any such plan or policy, no such order by Hitler, and no contemporary German documentation of any program to kill people for being Jewish. But there was a program, once the war started, to round up, isolate, and control the Jewish population for security reasons, and a plan to expel them from German-controlled Europe after the war; 2) The gas chamber story was pretty much a complete lie, which began to be planted in the United States press a few weeks after America entered the war, and circulated among the Allies as standard hate propaganda against the Germans from there on. The Germans did use the Zyklon-B HCN gas in the usual way, as an insecticide, to kill the lice that carried the typhus that was a major killer in the concentration camps; 3) The total number of Jews who died of all causes during the war was closer to one or two million than to six million, and probably none of them died in gas chambers.
That's the core of the argument, as I understand it. If we remove from the first one the four million Jews allegedly murdered in gas chambers so secretly that the operation left no internal records, then the two theses largely converge.
Another book you might try would be Walter Sanning's "The Dissolution of Eastern European Jewry". I ducked his name, and discovered Metapedia, which seems to be a more even-handed version of Wiki. I followed some links under his entry, and found an on-line copy of the book. I think we're allowed to post links here, but just in case, I've thrown in a couple of spaces, and removed the https:// .
codoh. com/library/document/the-dissolution-of-eastern-european-je wry/en/
Sanning is doing a population argument, proposing that the reduced population of Jews in Europe post-war is more the result of emigration than of being killed in place. The writing is easy to read, with plenty of footnotes. I think it represents one of their better books.