The speed limit is 15mph in other countries.
They probably just copied and pasted the spec from manufacture.
They are advertising it as 20mph bike in their video.
With 4" wide tires, the Conquer fat tire eBike from TUOTEG is the four-wheel-drive sport utility vehicle of the bike world - capable of anything!
tuoteg.com
Having said that, I can not tell you for 100% certainty.
I would call them and make sure and see why they have conflicting information.