录音中的“两个不满”是什么？到底是什么原因让他这么做？Why he did this？

[AnonymousSubmition-code]

在录音中的听到了是“两个不满”导致他“投毒”的，这两个不满是什么？作为实习生，他是对自己的转正KPI不满，还是对公司某些事情不满？对公司不满意的话，可以不转正去别的公司上班哇，为什么要定向投毒？是否有私人恩怨呢？
In the recording, I heard that it was "two grievances" that caused him to "poison". What are these two grievances? As an intern, is he dissatisfied with his positive KPI, or is he dissatisfied with something in the company? If he is not satisfied with the company, he can transfer to another company to work (he is a PhD at a famous University and has many opportunities) . Why target poisoning? Is there a personal grudge?