I had a look at this, and it looks to me like it's a 301 from another domain. Typically when domains get a manual penalty (primarily for spam), they drop in rankings overnight. So to counter this, you register a new domain and redirect it and overnight, your rankings bounce back. This technique is super common for blackhat sites like illegal streaming sites.
If the redirect is done as a meta refresh, then you can block it in your robots.txt from being picked up from SEO tools like Ahrefs, SEMRush etc.
These types of sites are called doorway pages and have been around for ages. They are most popular in Russia and on Yandex, but you do see them on Google for super longtail keywords with 0 competition.
The other important thing to remember is that doing SEO in any language that's not English is a walk in the park. Lots of SEO influencer types have case studies showing how much extra traffic they get by translating their content. [1]
Pretty impressive