As the zen saying goes, "don't be fooled by others"
I'm not a scholar, but it seems apparent from what i read in Wiki (wikipedia.org) Isaiah lived about 400 years before Guatama Buddha. Shakyamuni Buddha bears no resemblance to the way Isaiah is described by this:
The book of Isaiah, along with the book of Jeremiah, is distinctive in the Hebrew bible for its direct portrayal of the "wrath of the Lord" as presented, for example, in Isaiah 10:19 stating, "Through the wrath of the Lord of hosts is the land darkened, and the people shall be as the fuel of the fire.
Yet, I have to wonder about this, written long after Isaiah died, around the time of Guatama:
Gregory of Nyssa (c. 335–395), believed that the Prophet Esaias (Isaiah) "knew more perfectly than all others the mystery of the religion of the Gospel". Jerome (c. 342–420) also lauds the Prophet Esias, saying, "He was more of an Evangelist than a Prophet, because he described all of the Mysteries of the Church of Christ so vividly that you would assume he was not prophesying about the future, but rather was composing a history of past events."[
yet I have to wonder.... "because he described all the mysteries of the church" and how they functioned without the internet! Did no Buddha describe all the mysteries?
dunno! what lies under centuries of translation and interpretation?