That seems to be the correct folder...
What version of OSX might you have? Do you have the specific version of your After Effects? (ex: 14.0, 14.1, 14.2)
It doesn't seem to detect that the .plugin file is an after effects plugin either.. Are you certain that it is properly extracted from the .zip archive? Also are you certain that your version is not actually "10.12.15"?
I will have to set up my virtual OSX on my new system so it might take some time to recreate this issue on my end unfortunately;;;