next time you want start a sentence this way, perhaps instead just stop talking
Sorry, but when someone claims, 'I know more about trading than everyone here,'I expect his extraordinary abilities to translate directly into his financial success. Therefore, a simple fact check to verify this claim is justified. Can I start my sentence with 'Sorry,' or do I also need your permission for that?
Regarding the original question, the discussion somehow devolved into issues concerning having a residential address and difficulties with SMS verification.
I think there are two approaches. The simplest one would be for him to continue doing what he is doing and to transfer money for everyday expenses here, for example, by Western Union.
If he wants to pursue residency as a trader, I think the way to go is to open a company in his home country, trade from a company account, and have the company to actually pay him a salary. This approach is something that immigration authorities can easily understand. Now, this presents a similar situation to the common scenario of a person earning money abroad and needing to properly declare it in this country.
And by the way, I find the idea of transferring his main trading account here absolutely ridiculous, unless he is planning to trade mostly Argentinean stocks or bonds.