It looks like you took the number closest to 165k in the spreadsheet (166487) and divided it by 6000 to get to your numbers.  
That might be weakly implied in the article, but the GoFundMe page says that the donated labor is in addition to the cash expenses (and the money is explicitly listed as out of pocket expenses):<p>&gt;The deficit of $147,174 in out of pocket expenses has been covered by Professor Edwards’ discretionary research and personal funds. We also conservatively estimate that our total donated labor exceeds 3.0 person years (well over $165,000) of effort.