No, it didn't say that unfavorable information was being ignored.
It said:
Bush wanted to remove Saddam, through military action, justified by the conjunction of terrorism and WMD. But the intelligence and facts were being fixed around the policy.
Now, to your concern about "fixed":
From the Oxford English Dictionary, the one I think is most appropriate for a memo written in England by and Englishman.
fixed
• adjective 1 fastened securely in position. 2 predetermined or inflexibly held. 3 (fixed for) informal situated with regard to: how are you fixed for money?
Note the FIRST defintion. As in:
Bush wanted to remove Saddam, through military action, justified by the conjunction of terrorism and WMD. But the intelligence and facts were being
fastened securely in position around the policy.
Fits the thrust of the argument pretty well in its context.
The second definition?
Bush wanted to remove Saddam, through military action, justified by the conjunction of terrorism and WMD. But the intelligence and facts were being
inflexibly held around the policy.
I suggest to you that in this context, "fixed" is much more likely to be "fastened" than "inflexible", particularly with the use of "around the policy".
I think you make to much of the term "fixed" which I do not believe is as ambiguous as you seem to believe.
Be interesting if someone actually asked Matthew Rycroft what he meant by "fixed", don't you think?