This looks like some very finely crafted phishing.
Maybe I'm the dingus but, just not good vibes. Apparently it's probably "fine": https://x.com/github/status/2072801888525840476
Shout-out to the downvoters, may you continue filling randomly linked, MS Forms blindly from nameless accounts, eat your hearts out.
I also heavily doubt its a joke. Shipping a thousand CDs is a drop in the bucket for a company like this. The free marketing they get from this promotion more than makes up for any cost associated with doing so.