If you read the article it isn't the suicide verdict that is sealed it is other evidence given tot he inquiry but not published.
So perhaps the name of the CIA/Mi5/RAC agents that reported there were weapons, the names of current Iraqi politicians that were working for CIA/MI5/RAC.
70 years is nothing - there are still cabinet meetings from the Napoleonic wars that are sealed.
There wasn't any doubt about the suicide verdict.
The issue was that the scope of the inquiry was limited to investigating a very specific claim - about what David Kelly said about the report.
It was not allowed to investigate the real question about the truth of the report and "who sexed it up"
In American terms it's like holding an investigation into JFK's death but only considering the cause of death and finding that it was a bullet that killed him.
So they cherry picked some evidence to support a suicide verdict and sealed everything else. The article says that even the evidence they cherry picked was highly dubious.
They also sealed the autopsy reports which have nothing to do with intelligence agencies and are highly relevant to the suicide verdict.
I know every government conjures some James Bond secret agent fantasies whenever they want to hide something, but it doesn't fly here.
70 years is nothing - there are still cabinet meetings from the Napoleonic wars that are sealed.