There’s nothing in Acts that could be said to come from Josephus, what do you mean? Josephus does not mention Paul at all and has only a brief disputed reference to Jesus.
What I meant is that the author of Acts "borrows" themes from Josephus to create his story.
You can check out this interview with prof. Steve Mason: https://www.youtube.com/watch?v=wvfPxFQCpCU
Sometimes “themes” are just history repeating. There’s no evidence of this.
The timeline is also problematic because it’s entirely possible Acts was written first. Indeed IMO an earlier dating of Acts is pretty likely, the story is abruptly terminated after Paul has been in Rome two years with no natural conclusion, suggesting the narrative ended there because that took the author up to current events (60), where Josephus obviously wrote much later.