EMFs do not interact with everything they come in contact with.
Like I tried to explain earlier, EMFs have resonate and wave cancellation wave effects depending on the major or minor structures they interact with.
First you claim they dont interract with everything then you said they do interact just get cancelled out by some structures.
So they do interact. The honeycomb sandwich battery pack that Tesla is switching to should, because it absorbs EMF energy, prevent (cancel) the battery cells from interacting with said EM field . Thus preventing thermal runaway, in theory.