Actually the Medallion fund is only about $6 billion I believe. The rest of the money is managed in funds which are open to non-employees (and those ones don't make anything close to 35% annualised returns).
I don't think they meant every year was greater than 35%, I interpreted it as the overall average is more than 35%.
RIEF (Renaissance Institutional Equities Fund) RIDA (Renaissance Institutional Diversified Alpha) RIFF (Renaissance Institutional Futures Fund)
Of course there's probably still very large minimum investment thresholds.