Unless I’m also having an off day, the article is just really confusing. It makes sense to me that Italy would want the base back because it would be like selling a framed painting to Hitler and getting only the canvas back when it was returned. (Hitler, amirite?)
It’s probably a pretty nice base. Probably custom made for the statue shortly after it was unearthed, and probably the sort of thing that art historians would care about keeping together with the sculpture for art historian reasons.
https://en.wikipedia.org/wiki/Sources_for_the_historicity_of_Jesus
A google of “historicity of Jesus” will turn up some results. The wiki link is one of at least three very similar wiki articles on the topic.
tl/dr - it’s generally accepted that Jesus was a historical person but all that can be confirmed from written accounts is 1) he was baptized and 2) he was crucified.
Of course people can and do question the independent contemporary Jewish (Josephus) or Roman (Tacitus and Pliny) sources, but they seem to be in the minority. Even the less shady version of Josephus’s passage suggests that he was talking about a person who existed.
I don’t have anything to add since I’m not Christian - merely surrounded by Christians. I’ve done a fair bit of reading trying to figure out what’s going on with all that.