How many full nodes are currently running the ethereum blockchain? Is Ethernodes.org node count data accurate / reliable ?

When looking at ethernodes.org node counts, it hovers around 10'000 nodes.
https://etherscan.io/nodetracker shows ~8500 nodes.
It feels the crawler cannot reach to all nodes as, for example, when looking for a specific ENODE adress on ethernodes, is not always showing up.

Therefore the question to the community, what is a more reliable Ethereum nodes count?
Aka how many machines are contributing to the ethereum blockchain?

These numbers feel 'low' for the #2 blockchain by market cap, but maybe it's just the way it is.

Thank you for your feedback!