Apparently, Trumpenstein is upset that Kushner testified. I don't know what he expected. This isn't a Congressional committee. This is a criminal investigation being conducted by the Department of Justice.
This case has lots of moving parts. The article reveals a bit about what the DOJ may be going after. Of course, the DOJ isn't about to spread that all over social media, so let them do their jobs.
https://www.cnn.com/2023/07/13/politics/jared-kushner-january-6-grand-jury-testimony