They no longer publish everything they have been given (Assange once claimed to have documents embarassing to Russia but they are as yet unpublished).
They no longer publish documents indiscriminately (Podesta emails trickled out over the course of October 2016 for maximum political effect on the election)
If that wasn't enough, everyone should've been convinced that wikileaks is compromised when Assange refused to demonstrate that he held the wikileaks signing private key during his reddit AMA
https://www.theguardian.com/world/2010/dec/01/wikileaks-cabl...
What is Assange’s motivation for not releasing proof of the signing key, because he can’t, but keeping that a secret?
releasing some doesn't mean he released everything, or stuff Russia wasn't okay with him releasing.
Allow me to amend: Wikileaks now publishes Russia and putin related material long after they aquire them and only after they are called out on it.
They sat on the "spy files" for a full year, and only published them after their source went around telling other publications about them. https://foreignpolicy.com/2017/08/17/wikileaks-turned-down-l...
Based on this statement, you don’t seem to be familiar with WikiLeaks and didn’t read the linked article that specifically addresses this claim.