Well it said there were no addons to disable. I don't have a message about outdated templates at the top of admin, and not sure what I would do if I did.
That's not quite what I was expecting based on the server error log.
The errors happening on your site with the JS and the errors in the log very much look like you have missing or incomplete files. With that in mind, the file health check should be flagging those up.
Regardless of the results of that, we would recommend you re-uploading the files from the 2.1.0 download to see if that solves the problem.