Heres' a better written overview of the process: How To Configure SSH Key-Based Authentication on a Linux Server | DigitalOcean
It's for linux, not TrueNAS / Synology, but it covers the 'why' pretty well, and should be straightforward to adapt for your specific case using the specifics in the...
This is painful to diagnose on a forum, as there is no way to tell which steps of the original guide you've followed correctly, and which you've missed out / havent worked.
Additionally, the guide you're using is sloppily written - eg,
###Next will require vim or nano###
sudo nano...
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