I should also mention additional information that Vivian Gainer wrote to me regarding this problem. This correction is an important distinction from my prior post. :
"The problem is that we can’t provide date of death for many people because of the SSDI policy/regulations. (However, the date is ‘rolling’, so as soon as 3 years have passed, we can publish it.)
I don’t know exactly how this table will be used, but it would seem that it should represent all those who have died, not just those who died more than 3 years ago...
If any other sites are using DMF data, then it most likely will affect them, too, and may be a factor in any discussion about this."