I looked into it and it seems in esp32_rmt.c on line 53 there is a GitHub URL to a pull request (PR #16293 in the main MicroPython repo). It looks like a remnant from a merge commit message, code ...
These Drivers have methods for both SPI and I80 (I8080) busses, using the inbuilt MicroPython driver for spi or the I80 library from Brad Barnett's mpdisplay. They were (originally) created to be used ...