I understand your argument. However, I believe most people commenting here are actually correct; although the two bullet points seem redundant, they are not.
Please let me explain. Existing customers are people who ordered Soylent before April 25, 2014, and these people fall into two groups: Those who have received their first order and those who have not. For example, I may have received my first order on May 1st, but I’m not reordering until today. Obviously, I would not receive today’s order 1-2 weeks after I received my first order because that would be sometime back in May. My shipping estimate would be 1-2 weeks from today.
However, if I’m one of those existing customers who has not received my first order, then my shipping estimate is different. Even if I order more Soylent today, I would still not receive today’s order until 1-2 weeks after I finally get my first order. Who knows when that will be? It could be late July which would mean I may not get today’s order until August.
This is why two separate bullet points are needed for the two groups of existing customers. Incidentally, I fall into the Existing-customers-who-have-not-received-their-first-Soylent-orders group, something for which I am certain to need a therapist in the near future.