I think that would be key. If they were all individual, wow, that is sincere. If not - then its really just his writing style and you need to translate that into what it really means.
I know a few people whose business is to write ebooks and sales letters to sell the ebooks. They prey on desperate folks. And make a killing writing in a style very similar to this email.
This was totally miscalibrated for the audience, UNLESS the overall audience really did find "joy" from it and we're just exceptions.
