Why sitemap ranks for some keywords?


In India, for a popular keyword ‘matrimonial’, this sitemap page (https://www.shaadi.com/sitemap) is ranking in 2nd position for long time. Good number of competition is there but how these sitemap is ranking? because these page links to lot of another pages with anchor text éxample matrimonial’ ?

If a page has a good number of anchor links which points to internal pages, does it increases the source page’s chances of ranking for that specific keyword?

Having anchor links texts like ‘bengali matrimonial’, ‘gujarati matrimonial’, etc increased the ranking of ‘matrimonial’ for the sitemap page?

Otherwise, how the ranking could have been happened?