Yep. The ESPs are slightly different. Many of the ESP32 kit board include the “Auto-Reset & Auto-Program” circuit that is shown in the guide you linked, which also involves the RTS signal as part of the scheme. Toggling DTR to cause a reset still works, but this makes using hardware flow control for projects based on ESPs an impossibility.
This working fine, thank you!
One question, do you have the code you are using for the Arduino?
Made this Xojo program and the next is a simple Arduino program
SimpleReceiveAndSendText.zip (11.6 KB)
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A better Xojo program to test send and receive messages to and from an
ArduinoReceiveAndSend.zip (11.6 KB)
Arduino