Not to rain on your parade, but I have seen cats listed as these in the past, for sale at Big Al's near where I live (in Canada) at about the same time as you purchased yours. (2018) They were 100% hybrids. It's actually quite common to find hybrid synos here in North America, they are bred and exported out of the Czech Republic by the bazillions. The BA's I saw them at had them listed incorrectly (listed as Synodontis njassae ), and when I requested more info from the employee all he could tell me was that they came from their farm in Florida. lol
BTW - this is one of the largest tropical fish wholesale distributors in North America, based in Florida, and they list a number of their syno hybrids.
Hybrid synos have become so popular and common place over this past decade that some suppliers don't even hide the fact. Including hybrid crosses of S. njassae. See link below.
Catfish - Synodontis - SegrestFarms Small Animal Wholesale and Saltwater Fish Wholesale - Segrest Farms
No matter what your cat looks like, without provenance back to the wild there will be no way to determine its genetic make up.
To add to that, In Canada, I have seen hybrid synos incorrectly labelled at Big Al's, including S. njassae, so that really doesn't help add any credibility to this being one of the more uncommon cats found in the Rift Lakes. One of the PlanetCatfish experts is a personal friend of mine (syno321), and he confirmed my suspicions when I saw the tank of mislabeled synos at the Edmonton BA's a few years ago. Right around the same time that you discovered yours. Paul lives in Edmonton, and has been breeding synos, and supplying retail stores here in AB for many years. Probably a few decades now. He has also seen many hybrids for sale over the years.
Ohhhhhhhhhhhhhhh crap. Attack of the hybrids.
This is one of those times where I kind of regret buying a trade in fish, because there's literally no way to know where it came from.
That said, I bought mine from the Big Al's in Whitby, not Edmonton. So hopefully I avoided that hybrid fiasco.
Mine does look pretty much the same as proven wild specimens though (https://www.monsterfishkeepers.com/forums/threads/wild-synodontis-njassae.568141/). So there is that for it not being a hybrid.
If the consensus here is that mine's a hybrid, it will be traded in and replaced with, depending on what is available, a featherfin or legitimate Malawi catfish.
Sorry for the bad quality, but this fish really isn't the easiest to photograph. Loves his cave, swims too fast to get a good picture/video when he comes out, and I run the risk of getting stung (which would hurt a lot) whenever I try to shake him out of the cave for something like a photo shoot.