Is it wrong?
Let me check:
Let Vcc = 5V
Let LED Vf=2.3V @ 20 mA
5V - 2.3V = 2.7V
RCL = 2.7 V/0.020 V = 135 ohms
1 k != 135 ohms
Note: The OP's using RGB leds so his results (forward voltages, all different for R, G & B) may vary.
Yes, it's wrong.