Why does one need to "add weight" to the "stories about Jesus"? They believe Him to be a fictional character?
For certain people to come to faith, they first need strong physical evidence of Jesus’ existence and strong evidence of the veracity of the Bible. After they believe in their mind, hopefully the belief travels the 18 inches to their hert, but first the mind must be convinced.
Belief in Jesus Messiah is, and always will be a matter of faith. This find is yet more evidence that may help lead people to faith.
Just how does this discovery add any weight to stores about Jesus? That there were synagogues all over the Holy Land, including in the 1st century? Well, duh, of course there were and archaeologists have found another one.