New Mining Hardware Calculator from Genesis Block..

Is this correct?  Says my Saturn will earn me $16,800  ROI in 21 days..  Starting in Sept..  

http://thegenesisblock.com/tgb-launches-bitcoin-mining-dashboard/




Mining Payout Schedule
Display Currency

USD
Break Even Period:   21 days   Total Fixed Costs:   $3900
Max Profit:   $16,800 (Aug-14) - 430%   Monthly Power Costs:   $30.2
Month   Difficulty (MM)   Time per
Block (days)   Monthly Revenue   Monthly
Profit   Cumulative
Return
Sep-13   48   11.9   $5,600   $5,570   $1,670
Oct-13   64   16.0   $4,150   $4,120   $5,790
Nov-13   87   21.6   $3,070   $3,040   $8,830
Dec-13   117   29.2   $2,280   $2,250   $11,100
Jan-14   158   39.4   $1,690   $1,660   $12,700
Feb-14   214   53.1   $1,250   $1,220   $14,000
Mar-14   289   71.7   $925   $895   $14,800
Apr-14   390   96.8   $685   $655   $15,500
May-14   526   130.7   $508   $477   $16,000
Jun-14   710   176.5   $376   $346   $16,300
Jul-14   959   238.3   $279   $248   $16,600
Aug-14   1294   321.7   $206   $176   $16,800