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applicant lab provide this format for mit’s cover letter?
Yep! There are 2 samples on that page, and as an added bonus, if you go beyond glancing at it to read it, the body of each of the samples gives step-by-step instructions on how to set each one up. I strongly prefer block formatting to indented formatting, for purely aesthetic reasons, but honestly, it doesn't matter...
... because it's the content of the letter (and the substance + accomplishments behind it) that matters infinitely more than whether or not the address is left- or right-justified, so as long as your layout bears some passable semblance to a formal business letter, you're fine and it's not worth agonizing over

What's worth a lot more mental energy is: "Does my cover-letter prove that I have the personality traits that Sloan values in its take on 'leadership'?"
Best of luck!,
Maria
(edit: when the original post was quoted, for some reason the full link was cut off; here's the full link:
https://writing.wisc.edu/handbook/assignments/businessletter/)