They don't mention July the 1st in the newsletter:
Over the next few months we are bringing online enough hashing power to make sure that any delay in the Neptune timeline will be compensated with a completely free hosted hashing packages to all fully paid customers.
You need to read between the lines, the wording is carefully chosen.
Look at the underlined part, as they only said Q1/Q2 delivery they won't be late until July 1st.
and as far as messing up the network with difficulty..they are gonna do the same thing with the physical neptunes anyway.....you just expected them to stop after the neptunes shipped say if they were/are on time in what july 1st by the last batch
The problem isn't what they do AFTER the neptunes ship, it's that they are bringing online hashrate in advance of future sales, and that hashrate devalues existing and future purchases.