I've done it but unfortunately I can't be consistent because I have to sell it and stop buying it.
Planning to start doing a strategy like this again, but the amount will not be as big as that person did because of course it depends on each person's abilities and also the income that can be spared.
Because he comes from Europe, it means he earns quite a large income so he can consistently save quite a large amount, in my opinion, which is even very difficult for third world countries where earning that much income per month is very difficult.
However, whatever our abilities, if we do it consistently, it will have a good impact in the long term.