Let me ask you this. Have you ever read what actual, non-apologist historians have to say about these quotes you're pulling?
Firstly, you should know that there is a legitimate scholarly debate as to whether the section, "Christus....Pontius Pilate" is a later Christian interpolation into the text.
Secondly, if authentic, we don't know where Tacitus got this information. From Pliny? From what Christians told him? He doesn't say.
Thirdly, even if we just assume that he's right...it doesn't corroborate any miraculous claims of the New Testament. It corroborates at best that some guy named Christus was executed and his followers were later also persecuted. Okay. That doesn't make the New Testament writ large believable or reliable. Not even close.