They’re not listed as a reseller in Fairphone’s press release, so they’re not an official partner. I personally don’t think it’ll be available there as long as pre- and early orders are being served, which may take a few weeks.
Why not buy it from Fairphone directly? No need to artificially inflate wait time just to further support the monopoly and not-so-nice working conditions of amazon. 
(Also you may potentially have to go through amazon first for in-warranty-support when something is wromg with your device - at least that has happened to me with other non-fairphone devices. And as far I know Amazon they’re not really that fond of repairs. ^^)
Also take a look at this community-curated list of resellers: