Wow. I had to Google him.
I start some seeds outdoors but not the way he does. Lupins, columbines, daylilies, Siberian iris and peonies go into the planting-on bed in the fall - I basically harvest the seeds I want to propagate and plant them right away. It is even easier than his method. Maybe not as productive, but easy. If the birds left me any Cosmos seeds I would do that for them, too.
Vegetables - peppers are slow, I will be starting them early March for putting out beginning of June. I always have a few volunteer tomatoes where a tomato got left behid in the garden clean-up, so this year there are some tomatoes that got moved to a fresh bed and a label added, so if I get "volunteers" they will be on purpose and I will know what they are.