I'm not sure what this has to do with whether or not the dossier was a Russian disinformation campaign. Did they give him the intelligence? Were they expecting it to be released before the election (it wasn't)? What was the goal of the disinformation? The result was sanctions against Russia, which doesn't seem like something they would want to have happen.
Russian agents gave Steele dirt on Trump. Their motive is unclear. But I think its a bit naive to think Russian FSK agents were betraying their country to Steele for no real reason.
>Were they expecting it to be released before the election (it wasn't)?
It wasn't openly published before the election, but it was used during the election. It was given to law enforcement and major media outlets. Mother Jones wrote about it before the election.
It also included a lot rumors and unsupported allegations.