The times is a Leftist mouthpiece and propaganda organ, the letter is a nice summation of this.
It's pretty damning, specifically pointing out that the bigotry, racism, anti-semitism, and bullying that the Times is always attacking Trump and others for, is alive and well, and over-powering in the offices of the newspaper. Frankly, I'm surprised no employee, or fired employee has ever gone berserk and killed people after working in that environment.