All data on nodes are encrypted. We don't have access to raw data.
I participate in multiple blockchains through mining and through node creation. I do not have visibility into the data. I have visibility into the transactions, but not the data stored in those transactions. Those are encrypted with SHA-256, which is the strongest encryption right now.
The statement, if you want it to be clear, is that just because you have access to the nodes does not mean you have access to the raw data.