I'd say that SEO spam is not always deleted fast and I don't think it should be discouraged to report this if it is older than 6 months.
If you find such examples in the Russian section, you can send reports without paying attention to the term of the post or the topic. I personally process reports regardless of the date of the post or topic. And not only spam, but any violations of forum rules. Most importantly, you don't need to cross the 2018 boundary.