He's right. If you read about RSI you will realize that RSI is good in range bound stocks or markets. It's not good in trending markets. So if you have a stock shooting for the stars like BVTK today or ACGX earlier, it will lead you to sell way too early. The RSI will get overbought and stay overbought until the stock drops severely. Similarly, if a stock is collapsing, the RSI will go down to oversold levels and remain oversold as it continues to drop. So only use RSI in range bound stocks or markets.