Can micro needling and Latisse help repigment this very old scar ? (Photo)

I have personally been performing, with gratifying results, mechanical microneedling (no need for the added expense and risks of RF microneedling) accompanied by the application of Rx topicals, such as bimatoprost, latanoprost and topical tyrosine for many years already for the treatment of hypopigmented scars from all causes, including trauma, acne, self-harm, surgery, etc.
For "mature scars," (I.e. those older than three months , such as the one you describe here, realistic expectations for improvement ranges from 60-80% overall improvement in appearance when the scar is treated with the appropriate needle lengths, technique and aggressiveness needed to achieve optimal results. For this reason I would strongly advise against home self-treatment if this is being contemplated..
You would be wise to consult with an experienced, board certified cosmetic dermatologist scar treatment specialist and best of luck.