Oh boy, another one who thinks they just learned a history lesson after playing a video game.
And another baseless claim by you
Also, you just argue somebody else using Wiki as a source.
Have you ever noticed those tiny little things called "footnotes" on Wikipedia? If any article has no sources then I won't use it (your linked Tank archives article has no sources for most parts either btw.). If it has then I don't see how it would be bad simply because "Wikipedia"
Here is a great article about T-150 (or object 150)
http://www.tankarchives.ca/2013/04/prototype-kvs.html
Ah yes. Tankarchives. The guy who claimed that Soviets only lost 1.15 times as much men as the axis.
Also even his article states that T-150 refers to the very first KV 3 prototype that was built ... and that it was lost at Leningrad.
So your own sources speak against you: No T-150s as there only was one and also no T 150 at Smolensk. Also the article makes it look like the T-150 was the only KV-3 ever built so no "KV-3s" either ... or rather no Kv 3s at all
Also, see the picture below. M-75 can penetrate 188 mm armor at 1000 meters. The one you mentioned is M-42, it is another 107mm gun, which has a shorter barrel.
Still less than Pak 44s 210 mms at 1000 meters at 30 ° though. Also (according to another Tankarchives Article) the M-75 did not even pass trial stage:
"Since the experience of modern war did not confirm the need for such guns to fight tanks, further work on the M-75 gun and its ammunition is considered unreasonable. Reporting on the above, I ask for your permission to cease all work on the 107 mm M-75 gun"
Go out and start another post complaining about Ostwind being in the OST faction in COH2.
You may not have noticed this but development of CoH2 is already done while CoH3s isn't. Also Ostwind was at least used at the eastern front unlike Black Prince