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You have a defrosting issue here and I cannot understand why factory service cannot figure this out as this is nothing odd. There are only a few things that make it defrost, so it is not a hard job to fix the problem. Call someone else other than GE as the tech they sent does not know what they are doing.
My answer is the same. Have the repair person out when the fridge is not cooling well so they can easily observe what is causing the problem. Once the defrost issuse is determined then it is easy to figure out what needs to be replaced as only 3 parts make this defrost. I doubt the insulation theory has any bearing on the issue as the air passes thru holes in that wall.