Why is "Hidden State" at Node in Graph Neural Network Considered "Compressed" Representation?

I am reading article on Graph Neural Network (GNN) and it is mentioned:

The memory stores the states of all the nodes, acting as a compressed representation of the node’s past interactions.

Why is the hidden state or node's memory considered compressed representation of the node's interaction? Isnt compressed representation is what auto-encoders yield?

Topic graph-neural-network

Category Data Science

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