Its not a stay letter, just a standart mail. I also got this mail this morning (germany) and got my termination a couple of hours later. So it is NOT a stay letter. You will have a call with your manager if you stay and with HR for the rest.
People who got the "stay" mail are also not safe?
If you have not received a personal communication that tell you exactly where you stand i.e. Stay, Leave, Transition, or Divest - then you are in limbo just like many of us still are. In UK our formal letters will be available on 13th Nov.
It depends what letter are you reffering to. In EMEA all employees received a standard welcome letter which has similar wording (blah blah welcome to Broadcom family blah blah) to US stay letter but as you know in EMEA we follow differet labor rules so you can't really compare US and EMEA.
E.g. In some EMEA offices no e-mails were sent out (except this welcome one) and all changes were / will be communicated via managers / HR directly.
So I can only recommend to double check with your manager if you're not sure about your status.
If you got the welcome letter you know very well it is real.