No, that's not how it works. You see this all the time. Authorities happily repeat a narrative that exonerates them, but when that narrative becomes unsupportable, and the truth puts them in a a bad light, then suddenly they can't comment until investigations are complete.
The most egregious example of this I remember was with the death of Jean Charles de Menezes, where the Met happily chatted away about the "fact" that he jumped the barriers, but when it became clear he had used a travelcard, they then decided they shouldn't comment on it until investigations were complete.
