So much for the Talmud being written before Christians were around.
The Talmuds are based on material written in a 400 year period starting before Jesus was born.
You know nothing of Judaism
But apparently not the background to understand that "Yeshu" itself is an insult to Jesus Christ, not a shortening of His Hebrew name, hence why the footnote names "Jesus" in explanation, the Greek alliteration of a Jewish name, to help Jews understand who it is in reference to.
From Jews for Jesus:
"Consequently, centuries ago he was called by the name Yeshu, a “play” on His correct name that is actually an acronym standing for Yimmach Shemo Ve-zikro—May his name and memory be blotted out. He is still viewed that way by some, especially Ultra-Orthodox Jews"
https://jewsforjesus.org/newsletter-mar-2008/y-shua-or-yeshu
As for your links, I will stick to actual Jewish explanations on Jewish orientated websites. I have seen Jewish websites lie--when writing to Gentiles anyway-- about simple things like the time the Rabbis celebrated that a man died before he could be healed by the miraculous powers of a Christian. On a Gentile-directed website, they told only part of the story, saying that "Rabbis had positive relationships with Gentiles and even agreed to be healed by them." But on the Jewish website, we see the whole story.
The only people worse than Jews when it comes to obfuscating their own teachings are Mormons. Well, maybe it's about equal.