This is very common, my guess over 90% of descriptions are rewritten.
That's a very conservative estimate. I'd guess 99% with VERY high confidence, and 99.9% with pretty high confidence.
because i don't become email from dmoz.. about my submision
There's nothing email could tell you, that you don't already know. The site is listed -- everybody on the web knows that now! The description was change to meet current standards -- that can happen to anything in the ODP, any time. It's ALWAYS being improved, somewhere, somehow. (That's what editors do!) And all those changes are visible, again, to everybody; and none of them are reported separately to any of the people who helped get the description up to where it was before the last change.
It's OK to be interested in just one listing. But the ODP processes don't make any assumptions about that. You can suggest other people's websites, and you can suggest changes to listings of other people's websites. And they can suggest changes to the listing of your website.
All four million listings are provided to you (and everyone else) on exactly the same basis. All of them can be improved, anytime, by any volunteer with editing permission in the category. And when that happens the improvements are provided to everyone.
That's what it means for a directory to be "for surfers" rather than "for website owners". Granted, these days it's an unusual goal, so it surprises a lot of people.