It's by mistake.
He meant not Him at the second sentence

YOU SAY IT WAS MIMI AND HE THAT LOCKED THE SHOP AND YOU WROTE AGAIN IT WAS MIMI AND HE THAT LOCKED THE SHOP I DID`D NOT UNDERSTAND

<h2>Subject Case</h2>
When a pronoun replaces a noun at the subject position, they assume these forms:
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Subject Case
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Singular
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Plural
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First Person
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I
</td>
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We
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Second Person
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<td width="58">
You
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<td width="62">
You
</td>
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Third Person
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He She it
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<td width="62">
They
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<h3> 
 Note:</h3>
Subject pronouns above are used to refer to the subject of a clause.
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<h3>Examples:</h3>
I don’t know the way out.
You just saw the importance of reading.
He/She would not have been able to solve that problem if not for my encouragement.
Yesterday, we saw the need to embrace peace instead of acrimony.
As they came in, we parted ways.
<h3>Compound Pronouns in Subject Case:</h3>
You and I are friends; not you and me are friends
Zainab and he went to the supermarket; not Zainab and him went to the market.
Bassey and she were supposed to clean the dining hall; not Bassey and her were supposed to clean the dining hall.
It was Mimi and he that locked the shop; not It was Mimi and he that locked the shop.
You need to be conscious of the function of the pronoun when expressing yourself.
<h3>Subject Pronoun and Comparison</h3>
When you make comparisons of subjects, the subject status must be maintained and ellipsis should be avoided for clarity.
My father loves me.
My mother loves me.
But My father loves me more than my mother.
Replacing the noun phrase ‘my mother’ with a pronoun, it should be expressed as:
My father loves me more than she does. 
In a case where you want to compare your father’s love for instance for you and your mother, you should say:’
My father loves me more than her.
Other comparisons will be expounded in the object case.

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Subject Case

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Subject Case

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