DarkStar, Happy New Year and I appreciate the quick response.
I am on mac (as stated @ Mojave in response to other mac user running Catalina).
Your instructions are for PC.
No worries, I figured out a workaround. My sounds are on an external drive (it's a massive 14TB USB3). This is why I was having a problem - if I had everything on the mac internal/system drive, then everything would be in the user/shared/IK Multimedia folder and Sampletank would be able to find everything no problem. This is probably the way to go for most mac users.
For those more adventurous mac users that throw libraries on external drives, you need a few more steps. IK samples and synth products are storage hogs and Apple sucks with limited ability to upgrade internal/system drives, so I am sure this is a common problem for mac user that have the Max or large library bundles.
Simply telling Sampletank where to look for content is the correct troubleshooting step, but not 100% complete. It appears that Sampletank's sound management and internal database is unable to search/scan/catalog sub-directories. This is probably by design to improve load times and simplify sample management.
My workaround was to create a duplicate of the SampleTron library from ExternalDrive/IK Multimedia/Samples/Sampletron 2/ to ExternalDrive/IK Multimedia/Samples/Sampletron 2/Samples/Sampletron 2. Doing this wastes 8.4 GB space and is probably really dumb, but it seems to be where Sampletank is looking for the samples, so it works. Plus I have plenty of space on the external to spare.