It's actually not that ridiculous, though whether or not you really need to do all those things is a matter of personal choice based on your kids and how they are. But there is a truth to the fact that kids are very beholden to their circadian rhythms, and an hour time change can throw them off, especially when it's in the direct of losing, rather than gaining, sleep. My kids wake up at the same time every single day, regardless of when they go to sleep, for the most part, so the shift forward could rob them of an hour of sleep and make them not feel well or simply cranky.
I'm lucky in that my kids adapt rather well, but not everyone's kids do. While I agree doing everything in this article might be a bit overkill, the basic premise is a valid one.
And yes, that little bit of extra (or less) sleep does make a big difference. We had to adjust my son's bed time by 30 minutes because he was always groggy in the mornings, and it did help him.