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Lets! Not let's! Lets is a form of word let, let's is a contraction of let us. Those are completely different words and are not inrerchangeable

> inrerchangeable

This is obviously a typo. Which can't be said about deliberately inserting an apostrophe into a word

You assume it is deliberate. It's more likely that it was a simple mistake.

They keystroke that produced the apostrophe was deliberable. The keystroke that produced not the letter I wanted was not