Don't stop short. Let's look at all of the relevant passages in this section of Isaiah.
'Have you not known? Have you not heard? Yahweh is the everlasting God, the creator of the ends of the earth.'
'Who has performed and done this, calling the generations from the beginning? I, Yahweh, the first and with the last: I am he.'
'I am Yahweh, that is my name. My glory I give to no other.'
'I, I am Yahweh, and besides me there is no savior.'
'Thus says Yahweh, the King and Redeemer of Israel, Yahweh of Hosts, "I am the first and I am the last, besides me there is no god. ... Is there a god besides me? There is no rock, I know not any." ... Thus says Yahweh, your Redeemer, who formed you from the womb, "I am Yahweh, who made all things, who alone stretched out the heavens, who spread out the earth by myself."'
'I am Yahweh, and there is no other, besides me there is no God ... I am Yahweh, and there is no other ... I made the earth and created man on it; it was my hand that stretched out the heavens, and I commanded all their host ... I am Yahweh, and there is no other ... There is no other god besides me, a righteous God and a Savior, there is none besides me ... Turn to me and be saved, all the ends of the earth! For I am God, and there is no other. By myself I have sworn, from my mouth has gone out in righteousness a word that shall not return: To me every knee shall bow, every tongue shall swear allegiance.'
'I am God, and there is no other. I am God, and there is none like me, declaring the end from the beginning, and from ancient times things not yet done.'
'Hear this, house of Jacob, who are called by the name of Israel, and who came from the waters of Judah, who swear by the name of Yahweh and confess the God of Israel ... Listen to me, Jacob, and Israel, whom I called: I am he, I am the first and I am the last. My hand laid the foundation of the earth, and my right hand spread out the heavens. When I call to them, they stand forth together.'
And so on.
Isaiah 40-55 contains the most emphatic series of proclamations regarding the absolute uniqueness of Yahweh. All of the statements are written in Isaiah 40-55 to back up the claim that Yahweh is the one true God necessarily must be read as evidence in favor of that. If any of those statements are at all applicable to someone who is not
Yahweh, then these passages fail in that purpose. And yet, we find that several of the 'Yahweh alone is this' statements are applied directly to Jesus
Yahweh alone created all things (Isaiah 40,44,45,48), from heaven to earth and everything within. But the New Testament writers include Jesus within that act of creation (e.g. 1 Corinthians 8.6, Colossians 1.16).
Yahweh alone is the first and the last, the beginning and the end (41,44,46,48), and this is affirmed in the New Testament (Revelation 1.8). But the New Testament writers include Jesus within that emphatic declaration of God's uniqueness (Revelation 1.17; 2.8; 21.6; 22.13).
Yahweh alone receives the glory of all heaven and earth, he shares his glory with no one (Isaiah 42). But the New Testament writers include Jesus within that glory (Revelation 5.12-14).
Yahweh alone has the Name above all names, and only to Yahweh will every knee bow and every tongue confess allegiance (Isaiah 42,45,48). But the New Testament writers very explicitly include Jesus within that Name, proclaiming that every knee shall bow to Jesus, and every tongue shall confess allegiance to Jesus (Philippians 2.9-11).
The New Testament writers include
Jesus in the unique identity of Yahweh.