We've not gotten close to those yields.
My first crop of potatoes was good - but then came beetles.
Tomato yields were great last year - but this year things warmed up earlier - we've not really gotten summer heat - and EVERYTHING (peas, beans, tomatoes, raspberries) is 2 to 3 weeks late (seemingly all across Canada) while it's the first time ever that we've had a crop of lettuce (it usually bolts - but this year we had lettuce well into late July if you don't mind it a bit bitter).
Each year we generally find a wonderful new pest. This year it's flea beetles (destroyed my brassica crops). I've never so much as seen any of my lambs lettuce come up (been trying spring and fall crops 2 years running now). We still don't know what's destroying our beans at the community garden plots, or what's demolishing our kale at the home gardens. My late planting of Brasilian peans worked out well (I'm still getting some every week) and will plant them again. Likely coons are going after my corn - I planted Indian corn for grinding into flour and it's sweet if you eat it (raw) before it changes color and I'm hoping that they'll stay away from it as it's now dark and more starchy. All squash crops are pretty well shot again - vine borers are hell unless you spray spray spray (that now includes our neighbours and community garden).

We do have a "Square Foot Garden" with Mel's mix - and some things are growing well in there - but not the tomatoes (last year they did wonderfully but required watering AT LEAST daily or lots of blossom end rot - this year they seem anemic). Our of our 6 gardens tomatoes are really only growing well in one. By growing well I mean that I have to use more than those toy wire cages and use wooden stakes about 4' high in order to provide enough support to stop the fruit from tearing the plant to pieces (heritage beefstake, "boars heart" and heavy Italian plum types).

It's funny how Jeavons never mentioned humanure outright in his books - although I believe that they did use it (reading between the lines).