Those were carbon nanotubes not graphene. Graphene is one carbon atom thick sheets of carbon linked in 2D. The sheets are transparent. Carbon nanotubes are structurally and chemically different forms of carbon. They will react like this when exposed to an electric field in the same manner that dust will since their ends will have opposite charges and want to stick end-to-end like magnets would. Dust does this too in high voltage environments.
The power source here is a Tesla coil which outputs a much, much lower frequency than 5G transceivers do. A Tesla coil is a few megahertz at best compared to tens of gigahertz for 5G. The electric output at that distance is enormous because it's near a fucking high voltage transformer. A cell transmitter would not have anywhere near that high voltage output since it does not need it. Your conclusions are wrong and are purely conjecture based on you not understanding what you are seeing.
Here's a video showing similar results of self-assembly of metal balls that are far from microscopic when a high voltage field is applied. It's about electric charges and is simple physics at work.
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