I’m mainly curious due to a post I read with some very high, but slightly dubious numbers here
Here is a direct quote to avoid having to click that link.
What? Russia killed 90 percent of the german soldiers during WII, destroyed 80 percent of its tanks and planes, and even 50 percent of the entire german fleet of boats. By the time the americans even put a foot on Europe, Soviet Russia had already liberated 14 countries on the eastern font and was rolling, uninterrupted, in direction of Berlin. The germany america faced in 1944 was a german army who only had a tenth of the man power they had in 1939, whose ranks were decimated, who was financially ruined by the battle of Stalingrad and whose moral was at its lower. The german soldiersAmerica faced in France were mainly soldiers on leave from the eastern from, since more than 95 percent of the german army was positioned east of Berlin. That plus Stalingrad still being the greatest single battle in the history of mankind, i would say people do remember that russians were part of this one.
Exact figures for casualties are extremely difficult to pin down due to German underreporting of casualties and lackluster recordkeeping. Any number is an educated guess at best.
Your link is exaggerating but arguably substantially right. Sources vary but the consensus seems to be that ~75-80% of German combat casualties were incurred on the Eastern Front, and the proportion for Axis casualties will be significantly higher, as the other European Axis (excluding Italy) fought Soviet troops exclusively or nearly so, as did various volunteers and "volunteers" from neutral and occupied nations, etc.
The flip side of this is that there is much less agreement on the contribution to final victory by the strategic bombing campaigns by the USAAF and the RAF, the naval blockade imposed by the Allies and so on. And then there's the material contribution by American industry to the Soviet war effort through Lend-Lease. For example, about 1/3 of the trucks in Soviet service in 1945 were American made. How many German casualties is one truck for the Red Army? Is an American truck worth more (because Detroit never made a lemon) or less (because there's never ever enough spare parts for an import and it's not like you can just ask for the blueprints, call up the guys in Smolensk and get them to whip up the parts, those backwards capitalists are still using inches, you have to reverse engineer and cross your fingers). Are "trucks" even comparable? Shouldn't we be counting tonnage?
In conclusion, I don't think any serious person will argue that the Soviet Union didn't do most of the heavy lifting, with a lot of help from the Western Allies. Trying to pin down exact the precise contributions is a) a fool's game and b) really petty IMO.