I think you’re right. I got in on the April drop, not later. But i am surprised they also got aug 30 as ship date.
Well, to be specific the update I read was the one below.. If you bought in the April Drop its said to be Early/Mid August and the May Drop was Mid/Late August. I would guess that maybe the dates both did move a little but its still August for the April Drop hence why there was no email. The May Drop is now September hence them receiving the emails. Note that this update was posted the day before the May Drop so speak of the intention to deliver in August.
"Good news everyone! We’ve managed to move the production schedule for our THX amps up, and now have 1,000 more units scheduled to arrive in mid/late August. We’ll be opening this batch up for presale, tomorrow (May 30) morning at 10 AM PDT. This batch does not affect the 500 units sold in April, which should be shipping in early/mid August. Since we’ve moved this up from our Q4 2019 delivery schedule, these are currently the last production units scheduled for the year. We’re looking into increasing this, but this may be the last we see of the THX for a while."