Does Isaiah show that Christ is God the Father and God the Son?
Yes. The context states that in Isaiah, Christ was indeed God—He is God the Father and God the Son. It further shows the Father and Son are one and the same, the only difference being that Christ is God the Father in human flesh and appearance.
Les explains that Isaiah presents Christ as indeed God, both God the Father and God the Son. He then connects this to John 14, where Jesus tells Philip, 'He that hath seen me hath seen the Father,' showing they are one and the same. The only distinction is that Christ is God the Father in human flesh and appearance. This confirms the unity of the Father and the Son while distinguishing the incarnation.