Eufy security camera email thank you / sales page

Eufy raised 1m on kickstarter and sent out a thank you email to there list. They mentioned a 40% off sale at the top of the email and a "order now' CTA at the bottom. The first few lines of copy is a 1-2-3 combo of killer social proof.

1. The thank you headline had some social proof wrapped in. Raising a million dollars for anything says a lot.
2. The published the backer count of 3,793+
3. The countless gadget blog blurbs.

It should never just be a thank you email. "Always be selling"