To make it more clear to other members who are less focus...
"The only "official" statement is from the recent USA Department of War report to Congress, which says “The PLAN aims to produce six aircraft carriers by 2035 for a total of nine”
Nothing official or non-official from China side.
And to go one step further.
If it hasn't happened already, Pentagon officials will be questioned in person by the relevant Congressional Committees on the assertion that the Chinese Navy plans to build 6 additional carriers by 2035. Presumably they will be told it is from confidential intelligence sources with a high degree of confidence. Note that there would be over 10K people involved in building Chinese aircraft carriers, so it can't be a closely-kept secret. For comparison, the US makes its 30 year shipbuilding plan public
---
And if the report had said 4 additional carriers by 2035 (the current construction pace), it would have the same effect.
Which is to make the point (to Congress and elsewhere) that the US has to fix its naval shipbuilding mess, because China is outbuilding the USA.
So I don't see any reason for the Pentagon to exaggerate the Chinese aircraft carrier construction plan either.