Replays help others see the mistakes that you yourself missed. I'm gonna go out on a limb and say that you messed up in the economy and map control area's.
I.E. You focused on one area.
Actually was this a 1v1?
1v1, yes.
Economy was fine, I had control of the north and the south for most of the game. Replacing losses wasn't so much of an issue as more having the wrong army composition to deal with such a strange strategy, resulting a bunch of wipes that eventually snowballed. Only things I really fucked up on was losing the Pershing to some commando Raketens that jumped in from camo while it was repairing behind the lines, and not mining up while I had a muni float. But, anyway.
Theorycrafting: How do you deal with a unit like a Sturmtiger being so aggressively screened?
My go to was Rangers(Sturmtigered or crushed beneath the weight of the Volks), BAR Rifles (See previous) Pack Howis (Generally ineffective, probably bad micro on my part), a Sherman(Ended up being useful against isolated squads)and an M2 that got instantly Sturmtiger nuked. Jackson proved entirely ineffective due to shotblockers.
Main solutions I can think of in retrospect:
-Armour Company, Demo plays and M10s
-More mines to stop the blob and pick up periphery wipes
-Two Pack Howis
-Zook riflemen/RE blob to dive the Sturmtiger
-Advanced alien shielding systems to bounce the Sturmtiger rocket back into the Sturmtiger