While I tend to agree with most of that article, it appears as though they’re stating that Jesus, the man, didn’t exist. It’s my opinion that, while even circumstantial proof is very slim, it’s entirely possible that some guy named Jesus wandered about spouting off about being the Messiah, and was subsequently crucified for it.
Cricifixion, as we’ve been told recently, was hardly anything new or unusual for the Romans, and further, due to the turmoil of the era, the calls and cries for various saviors, messiahs or other divine interventions was similarly commonplace.
However, the page is also correct in noting that “Jesus” was hardly an uncommon name, and the description “Jesus of Nazareth” isn’t much different than saying “Samuel of Topeka, Kansas” today.
Basically, some guy got nailed for saying he was a messiah, based on preexisting religion and mythology, his followers took up the cause, weaving in more preexisiting mythology and attributing wonderful works to the figurehead, and another religion was born.
In short, yes, of course it’s very little but superstition and mythology. The man may well have existed- maybe, we simply don’t know- but we do know for a reasonably assured fact that the one work that refers to the man is itself significantly erroneous, often contradictory, consists largely of oral tradition, takes much of its foundations from a wide variety of earlier works, contains “eyewitness reports” written decades after the fact, and has very, very little corraboration outside of itself.