Thanks for the welcome.
There is more than one way to root a tablet. Mine, for instance, will not boot into recovery mode. I have an official rom from my manufacturer (from back when that company still existed). Also, I was able to download some development tools back then. The rom image file can be "unpacked". Then the tool puts the su binary and the superuser app into the right place and it repacks all files into a ROM image.
That image can be flashed to the tablet and then you have an updated tablet. I cannot install anything via a Zip file by booting into recovery mode.
Anyway al this does not matter much. How one roots or unroots one's tablet. It should simply work. If one app says your tab is rooted and one says its not then I ask myself how, precisely, app's determine if an Android device is rooted or not...?
P.S. My tab is a 7'' Rockchip29 device by a manufacturer called 'FView'. The support forum nor the company site exists anymore.