As far as I remember Splashtop is not removed when you uninstall Syncro agent. if you need to remove Splashtop you will need to do it first before you remove Syncro agent. There is a script in the Script Library that can help you to remove Splashtop.
This has been addressed many times. It will not uninstall the Splashtop streamer because it is common for all Splashtop products. You need to uninstall it separately. There is a script in the script library. Unfoutantlly Syncro has not updated the KB.
@randydod can you update the KB so there’s documentation about this