That is true for Arp page, not with one track OSCs.
It is a bit more complicated.
5th Sub is below, 7 semitones below.
In order to have a regular 5th, you have to make the sub the tonic, you have to tune OSC1 = 7. You can add a minor 3rd with Osc 2 = 3.
min with 5th sub is :
0SC 1 = 7 (sub is tonic, osc1 is 5th)
OSC 2 = 3 (osc2 is min3rd)
maj with 5th sub is :
OSC 1 = 7 (sub is tonic, osc1 is 5th)
OSC 2 = 4 (osc2 is maj3rd)
min7 with 5th subs is :
0SC 1 = 7 (sub is tonic, osc1 is 5th)
OSC 2 = 10 (sub is min3rd, osc2 is min7)
maj7 with 5th subs is :
OSC 1 = 7 (sub is tonic, osc1 is 5th)
OSC 2 = 11 (sub is maj3rd, osc2 is maj7)