GP didn't claim that Snowden worked for both countries. Snowden certainly did offer details of compromised Chinese networks to SCMP, which is now a propaganda rag for the PRC, in a failed attempt to gain asylum in Hong Kong. https://www.scmp.com/news/china/article/1266821/us-hacks-chi...

Snowden gave the full set of documents to Greenwald, Poitras, and The Intercept. Greenwald's opsec in particular is highly questionable, and I would be shocked if Russia and China didn't get a full copy from him. China had no need to barter with Snowden.