The risk with that deal is warranty from what I can tell. 90 day return policy and no commitment as to whether or not it is covered by Apple warranty.
“Product works and looks like new. Backed by the 90-day Amazon Renewed Guarantee.
-This pre-owned product is not Apple certified, but has been professionally inspected, tested and cleaned by Amazon-qualified suppliers.”
All depends if that’s important to someone or not. For me because I sometimes use my iPad for field inspections I like to have AppleCare+ coverage for accidental coverage so spending more on an Apple refurbished unit would be a consideration for me.