It's definitely a bit of a head scratcher. I was never informed of the emails going out, and that could be because they're really uncommon. As for the form not working, that's definitely another layer to be frustrated by, so I'm sorry for that.
What I would suggest is for anyone who has received the email, whether the form link is working or not, is to contact support directly and explain what you're seeing to them. You can reach them easiest here: https://bit.ly/3o1aRK5.
Hi again, esseffmatt.
Sorry again for the confusion over this. What I would suggest is to save the email. If you have any issues with your hardware and need to contact support, you can bring the email once again. I'm not sure why you were unable to get any answers from support, but again I'm sorry for that confusion. For now I'll close up the thread, but if you need anything else, please feel free to open a new discussion.
So the email you got is most likely legit then. It's actually pretty rare to get the email, but as your hardware has run diagnostics on itself, it's noticing that it's not performing up to spec, so it's contacted Google and they've sent out the email to let you know a replacement is available to you. The best way to handle it would be to contact support and engage via chat or phone call with them if the email form isn't working for you. You can see users on Reddit have received this as well, here: https://bit.ly/3rei0u6.
For contacting support, here's the fastest way to reach them: https://bit.ly/3o1aRK5.
Please let me know if you have any other questions on this.