Arduino UNO R4 WIFI - 1. Getting Started Local Webserver LED On Off

UNO R4 WIFI is built on RENESAS 32 BIT ARM CORTEX M4 RA4M1 chip.Also onboard is ESP32-S3 Mini for WIFI,BLE Functionality.
Your sketch is uploaded to RA4M1 chip and not to ESP32 S3.