Why coolix send is not using function of irSend ?

[MarkEvens]

void IRsend::sendHitachiAC1(const unsigned char data[], const uint16_t nbytes,
                            const uint16_t repeat) {
  if (nbytes < kHitachiAc1StateLength)
    return;  // Not enough bytes to send a proper message.
  sendGeneric(kHitachiAc1HdrMark, kHitachiAc1HdrSpace, kHitachiAcBitMark,
              kHitachiAcOneSpace, kHitachiAcBitMark, kHitachiAcZeroSpace,
              kHitachiAcBitMark, kHitachiAcMinGap, data, nbytes, kHitachiAcFreq,
              true, repeat, kDutyDefault);
}

above is hitachi protocol send fuction which is using sendGeneric from IRsend and below is coolix

void IRsend::sendCOOLIX(uint64_t data, uint16_t nbits, uint16_t repeat) {
  if (nbits % 8 != 0) return;  // nbits is required to be a multiple of 8.

  // Set IR carrier frequency
  enableIROut(38);

  for (uint16_t r = 0; r <= repeat; r++) {
    // Header
    mark(kCoolixHdrMark);
    space(kCoolixHdrSpace);

    // Data
    //   Break data into byte segments, starting at the Most Significant
    //   Byte. Each byte then being sent normal, then followed inverted.
    for (uint16_t i = 8; i <= nbits; i += 8) {
      // Grab a bytes worth of data.
      uint8_t segment = (data >> (nbits - i)) & 0xFF;
      // Normal
      sendData(kCoolixBitMark, kCoolixOneSpace, kCoolixBitMark,
               kCoolixZeroSpace, segment, 8, true);
      // Inverted.
      sendData(kCoolixBitMark, kCoolixOneSpace, kCoolixBitMark,
               kCoolixZeroSpace, segment ^ 0xFF, 8, true);
    }

    // Footer
    mark(kCoolixBitMark);
    space(kCoolixMinGap);  // Pause before repeating
  }
  space(kDefaultMessageGap);
}

which is directly sending IR from ir_Coolix file Why?

[MarkEvens]

OK This protocol has something different than Hitachi
and here sendData is used from IRsend