He is formally President of the People's Republic of China.
He is also Chairman of the Central Military Commission, though my understanding is that these go hand in hand.
He is also General Secretary of the Communist Party, so in the the context of the speech I suppose that this may be the most fitting title.
Edit: In response to temp8964 (reply to this comment):
What's the difference between Chairman and President in your translation of that title?
I understand that 主席 often (always?) refers to committees, etc, which may be translated as 'chairman' because of that. But really the difference between 'president' and 'chairman' is etymology and usage rather than strict definition, like is often the case in English: 2 words meaning the same thing with one of Latin/French origin and 'posher' and one of Anglo-Saxon origin.
A chairman presides. A president presides.
The usage seems to be that a chairman presides a committee and that a president presides a government.
Does he want to be be called president? Or was it decided that this was a better contextual translation?
This is arguing over nothing, really.
https://en.wikipedia.org/wiki/President_of_the_People's_Repu...