A pretty good debunking from the YT comments:

The problem with this hypothesis of course is that Nero, according to Tacitus, was already killing christians before the gospels even were written, according to this 'theory'. Furthermore, the Romans persecuted the Christians during 3 centuries, why do this if this religion was their creation and was intended to prevent uprises. And last but not least, the benign Messiah, until this day, is not seen by the Jews as their true Messiah, so the whole purpose of inventing the gospels was a failure. Not to mention the fact that Paul was a persecutor of christians before he himself became a christian and that he wrote his letters 15-20 years before the destruction of the temple in 70 CE, after which the Flavians supposedly wrote the gospels...

For my own debunking, I'll add that there are 4 or 5 non-biblical literary mentions of Jesus within 100 years of his death. Apparently this is a very good amount of references for the time period.