Recipe Conversion

I just read the Brewers Association style guide of Mild Ale. I liked the look of the Lusty Gnome Midlands Mild recipe. The author specifies 11 lb. of 2-row pale malt or 9 lb. of "extract" yielding an OG of 1.058. From the general context, I tend to think he's calling for LME.

The problem is, any way that I calculate it, it can't come up with more that 6.5 lb. of DME or 7.75 lb. of LME. Using 9 lb. of LME gives me an OG 0f 1.07!

Has anyone tried this recipe?

I haven't tried the recipe, but maybe that amount of extract is for a 6 gallon batch rather than 5?

I don't know the recipe, but that's a lot of grain/extract for a mild. A mild has an OG of 1.030-1.038 or so.

Recipe is clearly labelled "5 gallons".
The recipe is meant to be a "throwback" mild with a gravity reminiscent of 19th-century milds.