My spot market trading stradegy.
First we need to understood that coin the assets can fall down max of 100% and Even this one is very high %
That's wrong information my friend, in crypto world an asset can fall more than 2x to 4x depending on the previous pump that the asset as got. There isn't a fix range for falling of coins, and 100% is not a fix range for the dips. If you remember the case of Luna, and then that of FTX then you'll understand that those assets have gone many times down in their price, and that was way more than 100% in just few days.
Still, if we keep a positive outlook at your strategy than still there are many chances that you'll lock up your capital into a coin. The market in the times of bear run goes way many times below the range of 100%, and it hardly ever see a pump in those times. Any negative news in the market could create fear in the minds of the investors and within short period after that news the market can face huge dips because of bulk selling.
Your strategy might work in good market conditions, but a sudden bad condition could lock your capital for a long time if you applied the strategy with a useless coin that has limited use cases. I always recommend you to be careful with the strategy, and you should pick your coin more carefully because some of the coins won't get pumps after getting dumped, and the exchanges usually delist such coins.
I think you are not getting what he is implying here, by 100% fall he simply means that the token falls 100% from its current price which simply means that a token goes almost to zero which barely happens unless a project rug pulls. For example, if a token is worth $100 at the moment and it falls 30%, it will be priced at $70 after the fall, and if it falls 90%, it will now be priced at $10.
This strategy is basically good if you are using it for a coin that you trust and know that if it drops 30%, it will recover back and will go higher than the previous 30% that it has lost so that you don't get your money stuck in the trade.