Earlier quoted context omitted.
It is at least self-aware on that front: the first page says “Sorry in advance for all the run on sentences and grammar issues, I’m a youtuber not an author haha.”
That shows a total lack of self respect in my opinion. You don't have to be an author to put even the tiniest effort into your writing in a professional letter like that.
Define "professional letter". "Chicago manual of style" professional letter or some other, less professional styleguide? Because if it isn't written using the proper styleguide... I'm walking out that door before the first hour on the clock.