Just keep in mind that luvnest is a top 10 player, and I am top 50. There is a huge difference between the two. I was frustrated that I beat his a$$ from the start to the end and failed to close the deal. The issue is that I don't have a PRO endgame or PRO micro skills. My opening however is OP.
Just keep in mind that like all of us top ten players are humans and do not always play 100% correctly. It happens in SCII all the time. Your "OP" opening was only OP because luvnest did not get more counters. Of the units he got to counter your maxims they all did a great amount of damage. An earlier scout car would have put you hugely behind as it would just pick off outer maxims just like in the replay. a second sniper would of forced maxims to retreat when they got shot at because by the time they pick it up and run they'll be down to two men.
There are a few other ways this game could have played out:
luvnest chose the mortar half track, a large fuel investment. He could of just gotten a mortar and saved the fuel to pump out a P4 which would have set you behind to the stone ages as you had no conscripts to stop it from just driving about killing you only Zis and murdering the maxims.
Another way this could of gone down is a second scout car, the two of them upgunned would have slaughtered Maxims while the sniper picked off the last man
See there are many ways this could of gone down that would of driven off the maxim spam