Maybe they can't get the 8T gigapress in a timely manner so they can only make castings for a smaller truck with the 6T gigapress...
If it's not that, this news sounds BS to me. Elon now hates announcing new products and not being able to fulfill them.
My best guess is that:
CT single-motor is going away for good
dual-motor will be pushed as far into the future as possible (just like M 3/Y LR is now)
tri-motor keeps its price and there will be 2 variants
500miles+ with the original 70k pricing
300miles+ starting from 55k-65k