Due to the US-imposed blockade, all online traffic has to go through Venezuela - which is why the solutions described in the article are useful: they allow local "caching" of large files and a way to avoid low ping for gaming. The article implies all sorts of other stuff however.
This article is kinda weird. Accessing the internet is very easy in Cuba; the island has full 3G coverage and smartphones are everywhere. The only "restrictions" are US-based firms blocking access to their content to connections from Cuba (experienced this myself with zoom)
For years, Cuban teens resorted to espionage tactics to watch Game of Thrones and play World of Warcraft. Today the "SNET" stands as a a triumph of collective action: