Excellent. So now I'll take the above as a presentation of your argument. Note that I've changed the phrase "in error" to the more neutral term "false" here, so whether it was an error or intentionally false, no matter.
Now, the argument appears to be valid (if the premises are true, the conclusion is also true), so we should turn our attention to the unsupported premises, (1), (2) and (3). Far as I know, (3) is not controversial, so let's take it for granted unless we have reason to doubt it later.
(1) seems fairly plausible. Oh, it's possible that (1) is actually false, since it's possible that either the fire officials choose not to announce every important development or the press has moved on from this story and chooses not to publish an announced important development.
But the premise that I find most obviously dubious is (2). I think (2) is false. I don't think the change from "a diesel vehicle pending final investigation" to "confirmed to be a diesel vehicle" is all that significant. Indeed, it would be expected, perfectly run of the mill stuff. Most things which investigators say they believe to be true, subject to verification, turn out to be true, I'd wager. So I don't find it convincing that this move from "subject to verification" to "confirmed" is really important enough to require a press release, nor that it would be important enough that the press would necessarily publish articles about this totally not startling development.
In other words, if (1) is true -- that is, if developments that are important are announced to the press and the press will print stories about such developments, then I think that (2) is false.
Anyway, it's good to see where precisely your reasoning goes awry, isn't it? I eagerly await your entirely off-topic and perplexing reply. Or complete silence. Either one is par for the course, after all.
ETA: Thanks to
junkshop, we see that the fire department did indeed include the confirmation in a press release on Oct. 12th -- incidentally, one day before the web page we've been referencing went up. However, far as I know, no media outlets bothered to report the "upgrade" from "subject to verification" to "confirmed". Hence, again, either (1) is false or (2) is false, as I suggested.