If you can see inside it look for a toroidal transformer. The other way might be to check the voltage of the solar panels when it is doing some serious charging and isn't in a float condition. If the voltage consistently stays around 18 volts then you can be fairly sure it is an MPPT.
I am just giving an update on this thread as I too cannot understand it when a thread is left 'Up in the Air' so to speak.
The dodgy dealer on Fleabay eventually had to admit that their Mickey Mouse Controller wasn't what it purported to be. I reported them to the auction house but, as the items are still being sold, we can assume that EBay couldn't give a monkey's.
After the excellent advice given on here I bought an Epever Tracer Controller. I was impressed by the review given on You Tube thus.:
There seems to be a wide price range but, thanks to a discount code available to me I got the controller at sub£60.
Now that it's fitted, I can finally see just how much the solar panel is giving (or otherwise) on a gloomy November day.
Roll on the fitment of another panel on the roof and some Sun to shine.