Very interesting point. I prefer it as written (we know of Couperin's insistence that we play as he wrote the music).
Since the first quaver (sixteenth)of each pair both in the left hand and the right hand  is dotted, there's plenty of time to make slow arpeggios and do the acciaccaturas in the left hand. But should such a French piece be played strictly to the metronome? I don't think so. We can really expand the time within reason.

Best

Ph.

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