Adam Back has already confirmed that it is a scam.
if you have received this type of email, please delete it immediately and do not click on any link.
From what I heard random people received this phishing email even if they never purchased Jade hardware wallet or signed up for any other Blockstream services.
It is possible this people used their email for some stupid airdrops or they signed up for other crypto newsletters or they purchased some other brand of hardware wallets like ledger aka leaker.