Dealing with simcity is pretty easy as long as you identify it early and take the appropriate measures before the simcity player can reinforce his position. They have to sink in a lot of manpower and some fuel for bofors positions, mortars, retreat points if they grab it. As OKW and you went mechanized, if you come across a bofors you should immediatly consult your teammate for plans to destroy it or decide for yourself and cancel your luchs and go for a puma. Pumas outrange bofors guns so they can chip away at bofors positions without being fired on. Your opponet will have very limited PIATs if they have them at all and maybe 1 or 2 AT guns if they're lucky. The faster you get that puma chipping though the more your infantry can defeat your opponet, as they have to sacrifice their engineers to repair the bofors positions or lose the bofors. Stuka is alright against emplacements, it will probably force a brace once the brits hear the launching stuka audio que. Once you see a brace is popped, just think to yourself "ok in 30 seconds that brace is going to wear off and I can deal full damage to that emplacement without him being able to brace again." So say after 25 seconds you get your volks up close and drop double flame nades on the emplacement. Flame HT bursts from Ostheer also deal heavy damage to emplacements as well. AT guns work although the large amount of hedges on this map limited the firing arc and left them open to a higher chance of flanks. Incindiary ammo from axis MGs are also highly effective against emplacements, although it should be noted that if proper care is not taken MGs can be killed quickly by bofors and to a lesser degree 3in pits. As a side tip, bofors do very high damage to squads in the open, but they actually suffer heavily against garrisoned squads. Not that there were any garrisons you could've used with MGs or raks this game to reach an emplacement but just something to keep in mind.
Above all in team games, communication with your team is the most crucial part of any match. Failing to do so will result in a heavy disadvantage for your entire team. Coordinate with your teammates to use your MGs to push back infantry while having your AT guns fire at emplacements from behind them. If he braces then you can get up close with your infantry and drop flame nades or roll up a flame HT which can deal massive damage to emplacements even when braced.
If you're having trouble containing blobs get MGs. You lost your MG34 because you did not notice the bofors destroying the house it was in.
Another crucial point against emplacement play is to not bleed to them. They're sinking their manpower into static positions which can be destroyed without losing a single model of your own units if played correctly. Build some indirect fire and barrage his emplacements continuously. Have your MGs and AT guns covering the mortars for protection. Shift que attack ground on your mortars to keep up the pressure so your mortars don't change targets after the barrage finishes. Then when you can restart the barrage, as it has faster firerate.
I'd recommend watching this:
https://www.youtube.com/watch?v=MkVxsYNab0s&list=PLwkm_w8wXFhjEX14k1f3Z2EWgYuIFi-Cf&index=13
This is a "tip of the week" video from HelpingHans a professional coh2 player. The video displays helpful tips and counters to the simcity strategy.
Overall: Identify it early, understand the counters, utilize the counters, don't bleed, and communicate with your team.
Hope this helped. If you have any further questions, comments, or concerns feel free to ask.