Assuming he didn't mention any specific SEO requirements and your reviews were like your first post here (good grammar, written well, etc.), then I don't think you owe him anything.
It probably will take a lot of time to re-do the reviews the way he wants as it may require you to massively adjust your writing style.
Besides, the client paid and thanked you. The transaction was complete and then he messaged you again asking for extensive touch-ups bordering on complete re-do's.
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