We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
A lawn appreciates being plugged annually, spring or fall. This fellow omits one of the reasons to do it, which is the compacting of even good topsoil by people, dogs, lawnmowers, wheelbarrows, etc. Earthworms do a good enough job of this in a meadow, but not in a lawn. You can rent a plugger for a day quite cheaply.
It's easy to forget that lawns are not natural. They are, in fact, grass gardens.
If the plugs just melt back into the lawn, what really was accomplished? I had a very clay-ey soil at the house in which I lived several years ago and thought it might make some difference if I had the aeration done and then put down organic fert and sand in the hopes that it would cut the heaviness. Didn't live there long enough to see if I were on the right path.
I started mulching all the leaves into the yard last fall along with aerating. Had the best lawn in the 10 years I've lived here. Soil is hard packed clay but is getting better with annual plugging and mulching.
You either got it in time or you didn't. If you didn't, and it dies, put a stepping stone/birdbath.... over the spot until next year, then till and re-seed/re-sod. Been using (and abusing) Roundup since it came out, and what it kills stays killed.