In the OP, the very first justification they give is that:
This is the lead to his argument, when the armor of the Leopard is more or less irrelevant to it’s playstyle (Not to mention, it’s not substantibly worse than a lot of other MBTs around that BR). What does that demonstrate, if not a complete lack of understanding of the way a tank should be used based on prior experience with German tanks?
I think you seriously overestimate the average WT player’s knowledge of armor design and history. There are a lot of kids that play this game thanks to WT’s aggressive advertisements and sponsorships. Not to mention being a free to play game on Steam. And, of course, the most likely source for the average person’s tank knowledge will be History Channel and similar levels of documentaries, which focus almost entirely on WW2 for German armor, with nothing past that. Leopards never fought in any famous battles during the Cold War like the Patton and T-54, or the M1 and T-72.
That most of the European tank designers switched from armor first to mobility first during the 60s/70s is a fact reserved mostly for tank nerds, especially when the two largest tank producing nations largely stuck with armor over mobility.