I'd guess it's more because the Full Ti versions are ready (or expected to be ready sooner) and getting the sales done now helps cash flow. I'm sure the numbers help gauge interest, but based on what
@Brenyo has said before about how long it takes to get stock replenished, I imagine he has long since placed his orders.
To say that the Ti versions wont be available at launch just suggests to me that Brenyo expects them to sell out before the Aluminium heat shields and final accessories are ready to go.
As a one man band (still?), beyond the R&D, manufacture, QA, running webshops etc etc the logistics of packing, and shipping (hundreds or thousands? Idk) ~LOTS ... of these is impressive, and takes time, particularly when factoring in all the colour combinations and having separate stock for different regions.
More impressive though is how he has maintained this level of communication and service across multiple channels throughout (despite constantly being asked to repeat himself).