All these LSTM Stock Market tutorials seem to be a variation of this guys tutorial which he did a while ago:

https://github.com/jaungiers/LSTM-Neural-Network-for-Time-Se...

Except Jakob explains the folly of the method.

Whereas the author of this piece says the following:

From the plot we can see that the real stock price went up while our model also predicted that the price of the stock will go up. This clearly shows how powerful LSTMs are for analyzing time series and sequential data.