"If you dont have a fungus in your lawn do NOT apply this. Sounds to me
like
someone learned something and took it out of context.
Apply this late, and i mean late, in the season as a winterizer and
thats
it."

So, if he has fungus, it's ok to apply pure nitrogen? High nitrogen
promotes fungus and whether he has it or not, it's a good way to start
a fungus problem or make a small one worse. And the conventional
advice is a winterizer is a balanced product, with less nitrogen than
normal, not pure nitrogen. You could certainly use urea if you happen
to have it as a source of nitrogen, applied carefully, but for most
home applications, there are much better choices.