Curious. Your claim is that because Severus did not quote the section with Christ and Pilate that it was "missing." This seems to suggest intent was to copy word for word from Tacitus, whether it fit his theme or not. That of course is completely ludicrous.
Lets go to the text:
Tactitus
"Consequently, to get rid of the report, Nero fastened the guilt and inflicted the most exquisite tortures on a class hated for their abominations, called Christians by the populace. Christus, from whom the name had its origin, suffered the extreme penalty during the reign of Tiberius at the hands of one of our procurators, Pontius Pilatus, and a most mischievous superstition, thus checked for the moment, again broke out not only in Judæa, the first source of the evil, but even in Rome, where all things hideous and shameful from every part of the world find their centre and become popular. Accordingly, an arrest was first made of all who pleaded guilty; then, upon their information, an immense multitude was convicted, not so much of the crime of firing the city, as of hatred against mankind" Mockery of every sort was added to their deaths. Covered with the skins of beasts, they were torn by dogs and perished, or were nailed to crosses, or were doomed to the flames and burnt, to serve as a nightly illumination, when daylight had expired. Nero offered his gardens for the spectacle, and was exhibiting a show in the circus, while he mingled with the people in the dress of a charioteer or stood aloft on a car. Hence, even for criminals who deserved extreme and exemplary punishment, there arose a feeling of compassion; for it was not, as it seemed, for the public good, but to glut one man's cruelty, that they were being destroyed. .
To compare:
"And in fact, Nero could not by any means he tried escape from the charge that the fire had been caused by his orders. He therefore turned the accusation against the Christians, and the most cruel tortures were accordingly inflicted upon the innocent. Nay, even new kinds of death were invented, so that, being covered in the skins of wild beasts, they perished by being devoured by dogs, while many were crucified or slain by fire, and not a few were set apart for this purpose, that, when the day came to a close, they should be consumed to serve for light during the night."
Say, dejudge, there seems to be quite a lot of Tacitus "missing," doesn't there? I highlighted it for you! Well, for one, Tacitus calls them hated for their abominations, while Severus calls them innocents. severus also does not mention that they admitted it, were convicted, not for setting the fire, but their "crimes against mankind."
So much "missing." Hmmm, also missing is: "a most mischievous superstition, thus checked for the moment, again broke out not only in Judæa, the first source of the evil, but even in Rome, where all things hideous and shameful from every part of the world find their centre and become popular."
Now why do you think that those incendiary insults against Christ and his followers were not included in Severus "sacred history" that included his description of the martyrdom of the innocent victims of Nero?
Curious that Severus also did not include the claim that they were "criminals who deserved extreme and exemplary punishment."
Is it because they were "missing" dejudge? Perhaps something else, dejudge?
So much "missing."
tl;dr: just because it wasn't quoted, does not prove it wasn't there