For instance, someone has brought a 1955 radio into this side of the 21st century by adding an ESP32 inside of it. Now it can pick u ...

This will not work with Arduino IDE 1.6.5 (or below) or with non ESP32-S2/S3 devices (e.g. Arduino UNO, Arduino MEGA, etc.). To use this library you need to have Arduino core for the ESP32 installed.