But, just as a final nail in the coffin of this theory, your understanding of Precession cannot stand scrutiny. It is a complete misconception.
If I were to take a globe of the Earth tilted at the Angle of Obliquity - 23.5 degrees - and slowly and uniformly move it off centre in a circular motion exactly the same as that which is occurring now with the Earth and which gives rise to the phenomenon known as the Precession of the Equinoxes, I would trace out an imaginary circle in space.
If I decide to make the circle wider or narrower, I can. But, if I do, the previous circle ceases to exist because there can only be one circle at a time. If I speed up or slow down my movement of the globe, I can. But there can only be one speed at a time. Therefore, there can only be one aberration at one time, not two.
To say that the Precession of the Equinoxes can coexist with a new separate "Precession of the Earth" caused by the influence of an outside body (Niburu) is impossible. If "Niburu" has influenced the movement of the Earth then the Precession of the Equinoxes cannot exist at the same time.
Precession is not some mechanical operation affecting the spin of the Earth. Precession is the apparent movement of the stars around the circle of the Zodiac. Normally, this phenomenon goes unobserved but at certain times - just before the rising of the Sun at an Equinox (which is fixed timewise)- the movement of the stars behind the Sun can be measured. A very slow movement over centuries. Although still unproven, this is the common understanding.
The rest of this post is just a mishmash.