So, this guy explained in his Video everything you need to know, and you are asking how he done it? (are you.......serious?)
OK, translating for dummies.
He did what others don't. Leaving the box of thousands same concept videos. No generating bullshit and proof on start bullshit that everyone are using for years now.
He said, I just got mine, while he have 10 phones around him. LOL, he is using em to keep audience watching. He bought the attention with a table of iphones, starting from iPhone 5.
(it was that easy)
You can go to your local store, if you know the owner, ask to give you 20 models to create a short video or scene and do the same.
About his method, there is no need to discuss. He also was very kind and said that he is ready to do it for you, That is the concept: if you believe in hack, you search hack, you buy it.
With this tactic, he don't need to pay much in order to rank. He only needs to start the process with few K of views, rest is VIRAL. Because his concept is outside of BOX.
Go on Reddit. Post some shit = nothing, post something that users did not seen for awhile or never, boom, you are VIRAL.
The point is, new and 'looking good/promising' content is going itself, everyone will engage, and watch the whole video.
(and it's not that hard to make one)