I read long ago you had to get malware on the air gapped machine first to begin with, and then it's only accessible within a few meters. Also it can't be accessed through walls. That was years ago though, maybe it's changed now.
this post was submitted on 11 Sep 2024
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It's not reading the contents of RAM via EM emanations, it's using the EM emanations caused by certain memory access patterns as a side channel to exfiltrate data. Of course, that data could be anything, including whatever is in RAM, but the point is that you need to be running the code that generates the necessary memory access patterns to transmit the bits of data. This is not like TEMPEST where you can reconstruct a video display just using the emanations.