Great question — answering as the UphillTech team:
Actually, you don't need to touch the code for reversing the order of comments, simply visit the WordPress menu option: " Settings > Discusion ", and modify the attribute: Comments should be displayed with the " Older " comments at the top of each page. Tick the checkbox: Break comments into pages with "20" top level comments per page and the " first " page displayed by default. and that's all.
Full answer by Mike D.: https://stackoverflow.stackexchange.com/a/52504714 (CC BY-SA 4.0).
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