No matter what one believes for the various atonement theories, Christ did appease the wrath due us as a substitute:
Romans 5: NASB
6For while we were still helpless, at the right time Christ died for the ungodly.
7For one will hardly die for a righteous man; though perhaps for the good man someone would dare even to die.
8But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us.
9Much more then, having now been justified by His blood, we shall be saved from the wrath
of God through Him. (NASB)
In Isaiah 53 it does say by His stripes we are healed.
Isaiah 53: NASB
5But He was pierced through for our transgressions,
He was crushed for our iniquities;
The chastening for our well-being
fell upon Him,
And by His scourging we are healed.
6All of us like sheep have gone astray,
Each of us has turned to his own way;
But the LORD has caused the iniquity of us all
To fall on Him.
7He was oppressed and He was afflicted,
Yet He did not open His mouth;
Like a lamb that is led to slaughter,
And like a sheep that is silent before its shearers,
So He did not open His mouth.
8By oppression and judgment He was taken away;
And as for His generation, who considered
That He was cut off out of the land of the living
For the transgression of my people, to whom the stroke
was due?
9His grave was assigned with wicked men,
Yet He was with a rich man in His death,
Because He had done no violence,
Nor was there any deceit in His mouth.
10But the LORD was pleased
To crush Him, putting
Him to grief;
If He would render Himself
as a guilt offering,
He will see
His offspring,
He will prolong
His days,
And the good pleasure of the LORDwill prosper in His hand.
11As a result of the anguish of His soul,
He will see
it and be satisfied;
By His knowledge the Righteous One,
My Servant, will justify the many,
As He will bear their iniquities.
12Therefore, I will allot Him a portion with the great,
And He will divide the booty with the strong;
Because He poured out Himself to death,
And was numbered with the transgressors;
Yet He Himself bore the sin of many,
And interceded for the transgressors. (NASB)