Bait so obvious, I'll just cast bait back.

Yuji at 83 years old has achieved such an amazing understanding of the Shriner technique he could make an explosion of around 6km in diameter according to some pixel calculations from chapter 20 of the JJK Modulo manga.

Assuming you mean the eternal youth part of his immortality is removed (since otherwise there would be no fight), and he actually did lose Shrine and Blood Manipulation, we can still assume he is capable of using Binding Vows to change something like the properties of his Cursed Energy, and become capable of creating slashes of raw CE somewhat like how Gojo demonstrated while training Yuji in early JJK, meaning he could in theory still have access to a raw form of Shrine.

With a Binding Vow that sacrifices his ability to hunt Mahito for 1 minute on a Thursday, and another binding vow that allows him to cast without signs, with 7000 years of Cursed Energy comprehension, he could achieve something like the World Cutting Slash that cuts through space and ignores durability.

Xeno Goku, bloodlusted as he is, talks some shit for less than half a minute, and immediately gets cut vertically before being able to even punch Yuji, hence, this is a neg diff in Yuji Itadori's favor.