The average over the last seven rounds last year was 14.8k, maybe that's where he's pulling the figures from.
That's worst case scenario though IMO. There are enough key fixtures (below) to tide us over and keep us above last year's average.
R21 - Dogs v Dragons, Eels v Wests Tigers
R22 - Eels v Manly
R23 - Broncos v Eels, Dragons v Sharks (maybe even Dogs v Manly)
R24 - Broncos v Dogs, (maybe Roosters v Dragons)
R25 - Dogs v Cowboys, Storm v Broncos, Eels v Dragons, Knights v Souths
R26 - Broncos v Roosters, Dogs v Souths, Storm v Sharks, Warriors v Eels