Would the university (Go8 vs Non-Go8) that I go to somehow affect my chances of getting into post-graduate Medicine?
Short answer: No.
Long answer:
All accredited degrees are considered equal - the only time they are considered differently is in GPA calculation
if the university does not release percentage marks in student results (e.g. student scores 88% and is graded High Distinction for the subject, but the 88% is not released or shown on their transcript).
If this the case, then a particular GPA score (out of 7) is calculated by
GEMSAS for particular grades and these differ slightly between universities (see the last two pages of this
GEMSAS GPA document for a comparison of university GPA conversions).
Very few universities withhold percentage marks these days however and it makes virtually zero difference, because the different conversions reflect different marking practices and distributions.