conjugate points

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Is the poles being "conjugate points" from which the y-axis of an ellipse/spheroid is considered the conjugate axis/diameter?:

If so, then how can "ConjugateDiametersOfEllipse" be?:

Aren't they actually "oblique diameters"?
In "A treatise on analytical geometry", on pg.199, conjugate and transverse axes are noted, regarding oblate and prolate spheroids:

But, back on pg.107, the above concept of "ConjugateDiametersOfEllipse" appears to being discussed

How can that be? Are these two different meanings of "conjugate diameter?

~Kaimbridge~