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I went through that link and got WAY different numbers for upper and lower bounds.

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Then you need to check what you did wrong. I did exactly that just to make sure, and I get 1.90BB-2.32BB for 15BB standard deviation, 20k hands, and 95% confidence.

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Cell B1 -> 20000
Cell B2 -> 2.1
Cell B3 -> 15
Cell B4 -> 95
Cell B5 -> =B2-NORMSINV((100-B4)/200)*B3*(1/SQRT(B1/100))
Cell B6 -> =B2+NORMSINV((100-B4)/200)*B3*(1/SQRT(B1/100))

Is this what you have? I get 0.02 for Lower Bound, and 4.17 for Upper bound. Thanks.