General:
* As indicated
* As mentioned
* As described
* As outlined
* As specified
* As reported
* As confirmed
Emphasis on accuracy:
* Precisely
* Exactly
* Accurately
* Correctly
* Truly
* Indeed
Emphasis on formality:
* As per the statement
* In accordance with the statement
* Consistent with the statement
Emphasis on agreement:
* Agreed
* Confirmed
* Verified
Informal options:
* That's right
* That's the way it is
* As it should be
The best synonym to use will depend on the specific context of your writing.