Thank you for your feedback!

The focus of this article is on demonstrating how to create signal visualizations in Python, rather than backtesting trading strategies.

The data here is for illustrative purposes. However, you're absolutely correct—using "adjusted close" prices would be crucial for accurate backtesting, especially with stocks like AAPL.

For more in-depth articles on backtesting strategies, please check out our journal and EODHD Academy on eodhd.com. We appreciate your insights and will consider adding a note to clarify.