Yeah that’s right. For a whopping one time purchase of 250$, you get a lifetime license for a @linux.com domain as an email alias/forwarding only. You cannot send emails from this. You can contact support to check if the alias you want is available too.
Imagine this on your CV. It is the ultimate flex.
Yes, that is why it is called a forwarding address and both the picture and the post say you can’t send from it