At the time when JellyDOnut has 6 maxims out he still has a better manpower income than Luvnest and the maxims are so cheap to reinforce - pretty hard to compete in the manpower war against that. That's the reason why this strat is so abusive. Even when he gets the T-34 he still has an income of about 30 mp more per minute.
That game is actually a great example of why weapon team spamming sucks. Sidenote: WP by Luvnest.
But if we analyze this on a deeper level you'll notice that Luvnest, despite having less MP/min income generally has more available manpower - why? Because Maxims can't/don't bleed at all. I'd love to see the units killed/lost at the end of the game but I don't have time at the moment to watch the replay and find out - perhaps I'll edit it in tomorrow. You also didn't factor in that a sniper takes up more population than a Con/Gren squad, which was the cause of the disparity of Mp/min income early game.
Secondly you can see how vulnerable he was to the Sniper/MHT/222. The sniper had what... 44 kills when it died? And Luv could have easily saved it there honestly. The 222 was tearing everything up.
Thirdly (this is more directed towards Budwise's comment about no risk in weapon crews) Jelly gave Luvnest the ZiS gun that he needed to survive the 11 min T34/76. He also gave up at least a maxim or two and wasn't even close to wiping any squads until the T34 hit - which got some pretty lucky squad wipes let's be honest.
So yeah... spoiler alert - the guy that actually used combined arms ended up winning. Seems fine to me.
Also, Budwise you should watch that game if you still think that KV8s are OP or whatever stupid shit you said earlier today. Normally the people that think KV8s are still OP because of flamers ignoring retreat mods blah blah blah are losing their squads because they're playing poorly, not because KV8 or FHT are still over-performing. (I'll give you that the beta FHT was stupid OP though).