Well I can't speak to this exact case, but in the past Amazon has made their own product (which they get manufactured by a third party cheaply) to very similar specs and dimensions as the existing US market dominant product on their store - and then pushed them off the listing by placing theirs higher and slightly cheaper. Could be a similar case.
https://www.propublica.org/article/amazons-new-competitive-advantage-putting-its-own-products-first
