> criminally charged with making "false, fictitious and fraudulent statements"...
> In interviews with Defense Department investigators in 2018 and 2019, Lieber said that while he had heard of the Thousand Talents Plan, he had never been asked to be part of it...
The charge is not promiscuous collaboration, it's lying about it when asked.
If he indeed lied to DoD investigators following up on a possible conflict of interest, that would be a huge problem, on top of (we could guess) an original failure to disclose.