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1 is martingale
2 is scalping
3 is original one as we know first
4 is combination of 2 and 3 thats why you saw big lots with pending orders because this is strategy 2
The idea is to get all the portfolio of his EA to adapt to market and play with what you like. As I understand is strategy 4 with 2 and 3 is good to use and more profitable than just 3.
And very interesting part is that scalping one is not sensitive to spread (because its 30 for gold who is very big) so it can works better with broker with RAW spread
lots are different due to size of SL or TP i suppose but as you can see into the investor account those trades are made big pending orders not martingale grid strategy