I will answer the question as to why they, as Japanese, are so familiar with minor regions in other countries.
Those of us who were in the Japanese community...some of us were not satisfied with the Japanese Valorant,
than from the early days of the Valo scene,
infiltrated into minor regions such as Brazil (when it was not yet well known), India, China, etc.
There were also those who collected information on various players...such as Ninja, for example.
The information brought by the Japanese information importers - Japanese Ninja - made the Japanese very enthusiastic, especially about the Indian scene.
Skrossi is now hailed as a hero for his achievements and personality, and
Watching Global Esports matches is a more significant event than DFM or ZETA.
Even Tier 2 teams like VLT have enthusiastic fan group communities.
(Unfortunately, this Japanese community bans contributions from non-Japanese networks,
so it seems that contributions from overseas are not allowed unless there is someone acting on your behalf.)