Doubt it. From the look of how the story developed it seemed that Russia very much wanted it not to be a bomb and this is how their state media presented it at first.
Of course that choice went away after the UK announced that they believe it was a bomb and are taking their citizens home without allowing any luggage on board of the planes.
But the Russians are such disinformation artists you never know what to believe coming from them. They say things they want others to believe. This doesn't mean it's the truth, or that they themselves actually think or believe it. For some reason they might simply want the world to think that they think it wasn't a bomb. They are masters at the complex game of chess, thinking many moves ahead. We in the US, unfortunately, have a hard enough time playing checkers.