Because
1) Spondoolies themselves chose to announce in their own thread
2) The thread is controlled by them, not a random person
3) That allows them to control their own information and change it if/when it becomes outdated
4) The link in this OP trolls the email campaign tracking
5) Bitmain has magnitudes more individual customers than Spondoolies. Spondoolies prefers to sell a tonne of product to one guy, Bitmain prefers to sell a product to a tonne of people.
Bitmain has probably 10 major threads that pop up when important:
S1, S2, S3, S4, S4+, S5, S7, C1, U3, Bitmain.
Let's ok, i don't want to disrupt anyone...
This post is close from now. The oficial post is: https://bitcointalksearch.org/topic/m.12501537