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That chart is showing ONLY the PUBLIC nodes and channels.
But you are missing out another important aspect: LN is having 2 types of nodes and channels: public and private (unannounced).
LN is much bigger than what you see in those charts.

Here is a guide about private nodes
https://darthcoin.substack.com/p/private-lightning-nodes

is there some more relevant data demonstrating the network growth?

No, you can't know exactly how big is LN. And that is kind of good thing. More privacy.