Pretty underwhelming. From the very limited experiment demonstrated, the LSTM seems to be playing catch up rather than actually predicting trends.
Many data science thought pieces don't quantify the results, and it's suspicious that they're not included in detail (typically, the R^2 of a simple stock market prediction model is super low, making it impractical putting actual money on the line as it's barely better than guessing randomly: https://twitter.com/minimaxir/status/1021885939361042432 )
In the stock market something that is consistently better than guessing randomly is very valuable! You don't need much of an edge to make a lot of money.
(I'm very skeptical about approaches like the OP though)
That’s not playing catch up, if the prediction was made at time 0.