No, I'm saying what the code does, does not agree with what the comment says.
The clue is in the end condition of the loop, and what gets written to the servo or ESC object.
for(pos = 90; pos < 130; pos += 20) // goes from 90 degrees "neutral" to 130 degrees "foward speed"
You might think from the comment that the values 90, 110 and 130 are written to the servo object, but in fact, the values written are 90 and 110, simply because 110 + 20 is NOT less than 130.
As I said, this may or not be important to the correct functioning of the device, but it could confuse someone at a first reading.