ESP8266WiFi.h issues - again?

Hi, now I’ve got this Troyka WiFi module built on ESP8266 and trying to get it to work as decribed in the manual (Connecting to Internet With ESP8266-based MCUs — XOD), it also says on the shield description that it’s supported by XOD out of the box (Troyka-модуль Wi-Fi на ESP8266 / Купить в Москве и СПБ с доставкой по России / Амперка) but I still keep getting this error message while flashing the Arduino Leonardo I’m working with:

Begin compiling code for the board Arduino Leonardo :package:

C:\Users\morey\AppData\Local\Temp\xod_temp_sketchbookPhANXd\xod_1673384596009_sketch\xod_1673384596009_sketch.ino:980:10: fatal error: ESP8266WiFi.h: No such file or directory
#include <ESP8266WiFi.h>
^~~~~~~~~~~~~~~
compilation terminated.

Error during build: exit status 1

I have installed the ESP8266 support for Arduino IDE and the ESP8266WiFi.h is there.