I've been following this mess for a while. Banon/Guo has been playing up Yan since she fled HK in late April. She's been doing media circuits on usual alternative media properties. HKU, her previous employer released a statement characterizing some of her claims as "hearsay" and rejected her assertion that she worked on covid19 early in the outbreak [0].
Brief timeline:
mid April - China indicates they will hammer National Security Law to HK*
late April - Yan defects
Early May - rumors spread of alleged Chinese virologist defection, western rag media misattributed to Shi Zhengli "bat woman" who worked at Wuhan institute of Virology. She's 56, renown in her field.
Late May - Chinese media confirms it was Yan MengLi, she's in her 30s, and basically a labtech. They traced her to Guo's villa in NY, alleging that she paid her to defect [1].
July - Now - Yan starts her wave of interviews on western alt media. HKU disavows her claims.
Late August - Banon/Guo is being probed by FBI.
Now - Banon/Guo doubles down on Yan and lab modification narrative.
*NSL law timing is significant, the fact that she bailed HK so fast after NSL announcement is (conjecture) because she was already in contact with Guo prior. Guo is at the very top of CCP fugitive shitlist. CCP doesn't do much social media manipulation on western platforms, but when they do, he's almost always targeted. She would have been 100% dead if they found out she was coordinating with him regardless of the credibility of her claims. Personally, I think she's digging for a US VISA and at least being paid well by Guo, Banon/Guo digging for good graces with Trump for FBI probe.
[0]https://www.hku.hk/press/press-releases/detail/21274.html
[1]http://www.nextdigital.cc/index.php/2020/05/22/%E4%B8%AD%E5%...