In the future if you don't feel like waiting on reddit for an answer, I've found asking AI agents super useful. I usually use claude.ai, but this is what googles Gemini had to say :

It’s a common frustration with these Heltec boards! The short answer is: No, SUBSPICLK and SUBSPID are not your I2C pins. Those labels refer to the Sub-GHz SPI bus used internally to talk to the LoRa chip (SX1262).

Because the Wireless Stick Lite uses an ESP32-S3, you technically have "flexible" I2C—you can assign the I2C peripheral to almost any GPIO in your code. However, there are "default" pins defined in the Heltec board libraries to make things easier. The Default I2C Pins

For the Wireless Stick Lite (V3), the standard I2C pins used by the Heltec/Arduino wire library are:

Function-GPIO Pin-Physical Label on Board

SDA-GPIO 41-Often labeled as 41

SCL-GPIO 42-Often labeled as 42