I know you are looking to hear from Super Dave and not his followers and fans, but maybe I can provide a bit of piece of mind.
His post states the parts were machined smooth, not polished. This should be read as smooth, ready for finishing, whether that be polished or satin depending on your choice at the time of your order.
I sent back my P+ soon after my pre-order in hopes Super T would re-finish it satin in the same media blasted batch as my Strata so the finish would match perfectly. Although the initial reply from Super T was basically "We'll try, but don't count on it" I got an additional reply stating that they were holding my P+ so it could be re-finished in the same batch as the Strata to match. This is sufficient evidence in my eyes that Satin is indeed the final finish, and anyone who specified satin as a finish at the time of order will indeed receive a satin finished Strata.
In my experience, Super T is a perfect example of a manufacturer that holds true to what they have advertised, other than estimated times of completion. Every item that I have ever purchased from Super T has been exactly as I expected, although on some occasions the time it took for me to receive said items has taken longer (some times much, much longer) than expected. IMO, the reasons for longer than expected wait times are always quality driven in an effort to ensure customers are without complaint in regards to the product they receive.
I hope this post settles your nerves, even if just a little, as I am 100% confident you will receive exactly what you ordered...
FWIW