It could be 100% organic due luck, the video hits at the right audience at the right time and it just keeps getting recommended. I have videos with millions of views in a demonetized channel, since YT does not tell which videos demonetize a channel and I don't want to remove the videos, I left them there, since I spent a lot of time and people still like them. The channel is abandoned and still picks millions of views. It was 100% organic, paying for SMMs is a waste of time. Also login in with proxies just adds more variables and chances you end up login in with a flagged IP and you never know if that is negatively impacting performance.
This guy probably had a massive lucky strike, one hit wonder since his second video doesn't pick up views.
Don't get it twisted: The most important factor is luck. You can have great content, and not be lucky. There is just too many videos out there. YT profits from this luck factor, so everyone tries to make content, they profit since the very second you upload a video since you bring them traffic for free on their website, so all this people hoping for the pipedream of making a living on YT keep uploading videos, and few of them will make any amount or relevant money. The SMM sellers are just selling crack. Botted views are trash. While Google is trash with their AI randomly striking and demonetizing, im pretty sure fake views are easy for them to spot. Similarly, people selling courses on "how to make money on YT" and "exclusive information" and whatnot are also profiting from this.