Winter is not for beginners going it alone - not overnights anyway, unless you are somewhere like Glacier Point Road and the place is swarming with skiers and other walkers.
Eating snow is a bad idea - takes too much energy for the body to melt ice. That hastens hypothermia. Energy is important - calorie intake and water intake should increase quite a bit, because you are not only working harder, you are likely not feeling like drinking.
Winter weather can change on a dime and things like knowing what to do in a white out and how to dig a snow cave are really important for longer outings. While your article is a good start, there's nothing addressing how to dress in winter, or issues such as frostbite - when it's 20F all day, and you're in the cold the whole time, tips of noses and chins can start to lose skin as the fluid in the cells starts to freeze. Scarf, balaclava, neck gaiter or other means of covering skin to keep it warm are important. Sometimes in biting wind or sleet/snow a pair of goggles with uv protection can help. Eye pro is very important - glare off snow can blind you faster than glare off granite.
Unless you know the snow is not deep everywhere - a shovel is a must. Digging a hapless person out of a tree well or digging a snow cave or merely making a place to pitch that winter tent (walls around the edges to prevent draft and spindrift).
No newbie should go out overnight without an experienced winter camper, IMO.
In short, I don't think an article for newbies is complete without putting forth a basic understanding that winter is a completely different beast in some parts of the country, and should not be underestimated. The Sierra is my backyard and yet, as mild as the winters are said to be, winter is not anything to wander into with three season gear or without the knowledge of the risks that are present any time day temps are below freezing and the snow is piled deep. How to get water changes. How to stay warm AND DRY (this isn't mentioned in the article either, and it is IMPORTANT especially on an overnight) changes. How to avoid avalanche zones - there is a clinometer on my compass, and I do know that this is why - and how to not fall through into creeks flowing under the snow (MUST be mentioned for anyone traveling in deep snow).
There are a lot of things that folks don't even think about that can be dangerous. A friend of mine, for example, will not snowshoe without a helmet. While out one day on a day shoe a huge pine cone fell and missed him by just a few feet. It was encrusted with ice and must have weighed ten pounds. Newbies I take snowshoeing often bring no rain shell - I always do, as on a sunny day it rains freezing snow melt falls out of snow covered branches as we go. I've been known to take an umbrella. I always take a stove and a piece of ccf to put under it to keep it from freezing into the snow (canister physics) - warm drinks on cold day outings help newbies who are getting mildly hypothermic due to making do with their usual hiking clothes and not taking me seriously when I make suggestions. Waterproof boots! extra socks in the pack!
Making the point that winter camping involves a lot more prep and more skills than any three season trip would go a long way to helping start newbies on a safer path. I don't think you have to write the comprehensive guide to winter camping, but I do think more information about why more care and preparation is needed for trips out into the snowy wilderness. And as always, even on day trips (because driving in winter is also more dangerous!) everyone should leave an itinerary with someone at home. reconn.org is a great tool that all backcountry travelers should know about.
Allen and Mike's book is a great start. So is the page over here - http://www.princeton.edu/~oa/safety/hypocold.shtml
William Forgey wrote the most quoted text on cold injuries.
Freedom of the Hills (the mountaineering guide) has a ton of great information on snow travel as well.