Ok......... Let me quote what is written in the report.
Look at the underlined part. It specifically points towards the version. Now any air launched dumb bomb too travel on its own for a fair amount of distance. And another interesting thing is in the words choosen to write it. Let me quote the same PIB source which is there in official website of BRAHMOS.
http://www.brahmos.com/pressRelease.php?id=75
It is the same report, but it is missing this very line. You need to always keep in mind for whom and where the report is released. The report you quoted conveniently said that it does have ranges of more then 400 km, but no where it is mentioned that the missile which was tested traveled for 400 kms.
The absurd thing about limiting the fuel is that, by increasing fuel, you would be increasing the overall weight of the missile. With that weight increase and same engine, it would loose its vital strength of speed. P-800 is not as fast as BRAHMOS and onus of BRAHMOS is in its supersonic speed throughout the flight. So by saying that we would be increasing the fuel amount, you could increase the range, but would cripple it in speed.
And
@binayak95 too said the same what you are terming as gibberish.
Aside
@binayak95 ............... How much time and effort it would require to replace the flight computer of the missile according to you. I am sure that you might have seen the real thing in person. I am not talking about the ones in display here.