The first set of numbers provide the peak across all (4 or 2) antennas for each band/radio (AP-315 has 4 radio chains and antennas for 5GHz and 2 chains and antennas for 2.4GHz).
Traditionally, peak EIRP would be calculated by adding the peak antenna gain to the max conducted power and multiply this by the number of radio chains (equivalent to adding 6dB for a 4x4 radio, or 3dB for a 2x2 radio). This is ok if the conducted power is the same for all radio chains (typically true) and if the peaks for all patterns line up perfectly (in a 3D space). That is generally not the case, and in reality the peak EIRP is significantly lower.
This is why we're also specifying the peak of the combined/averaged patterns for both radios. That is the result of combining the patterns in 3D, and determining the peak of that combined/averaged pattern.
That is the more meaningful number when determining peak EIRP.