In fact, I think that is wrong, too. That is the growth in tor Nodes. So, yes all accessibly nodes are counter here and the TOR nodes are in the top group.
Here are all nodes (accessible or not):
and tor nodes:
The numbers don't quit sync, which bugs me as a data architect, but it isn't my data.
Those numbers seem more realistic
These are nodes that have port 8333 (or their configured port) open to incoming connections. These are the ones that can be "seen" and counted by services like that website....tons of users run Bitcoin nodes behind firewalls, NAT, or Tor...they don't accept incoming connections and thus aren't easily counted by public scanning sites.
