Does using higher ISO settings increase the risk of more aberration? From what I have experience I see more aberration occurring with increasing my ISO settings even from ISO 400 compared to ISO 100.

From this day on- TRIPOD, TRIPOD, TRIPOD, TRIPOD to anywhere I go and ISO 100...

I don't think ISO has anything to do with CA (if that's the type of aberration you're talking about). Possibly you're also changing f-stop too which could have an impact. Subject matter is the biggie - and where it is in the frame.

Have a read here and here. In general, Lightroom 4's automatic CA removal works very well with my camera (5D MK II) and wide angle lenses

No. He must mean Chromatic-aberration and its got nothing to do with high ISO,  its either the sensor or the lens. Sorry to say it but most often its got to do with either a bad copy of the lens or just cheap kit lenses.
Its nothing to worry about you just remove it in the raw-converter tool for chromatic aberration.

Did you mean chromatic aberration (blue-yellow or cyan-magenta shifts along contrasty edges, particularly towards the edges of images? I don't think ISO has any effect on that, that I've noticed. The lens profile in ACR does well in eliminating the cyan-magenta shift, which IMO is more common. Not so good for blue-yellow.

Or do you mean colour noise, which appears if you have to lighten shadows, and is worse with higher ISOs. There are various ways you can tackle this, but start with the colour noise slider in ACR.

OTOH, I had an image accepted (iS) XXXL (full size) yesterday, that was taken at 1600 ISO. 

wow 1600 iso that is amazing! it is chromatic aberration mostly blue-yellow issue such as tree leaves against a bright sky or a building edge against the sky...

Is that blue-yellow, or the dreaded 'purple fringing', which is a real PITA.