Matthew Livelsberger "manifesto" email, likely faked

Looking at the email allegedly sent by cybertruck bomber Matthew Livelsberger to retired U.S. Army intelligence officer Sam Shoemate some days before the car bomb went up… I see a major problem - if you use Proton Mail you will know right away, especially if you use the Proton Mail app for Android. It tells me that “manifesto” email was very likely faked. If so, then whoever faked it (CIA? FBI?) might like to get in touch with me and I’ll fill them in on how to cover their tracks.