Can I convert this to Arduino IDE

In this example, the user is flashing a new firmware to the serial controlled motor driver.
Could I just use an UNO to load my sketch to it?

I've never programmed in C, just in Arduino IDE, so not sure how to convert my sketch to C. Does the IDE do that maybe when it compiles it?

Thanks for the help on learning about this. If anyone knows any good tutorials that help...