Yes they do remove virus defintions and add/change the name of some,
however,
If you had taken a little time to enquire why (seeing as Norton are not
hiding the fact) you would have discovered, like I did, that there is a
valid reason.
I ran a selection of you "proof" and got the following results :
eumel.391 = Hoax
Delta.1167 = Hoax
Baloo.Family = Hoax
Bloodhound.IU.01 = Hoax
Bloodhound.IU.02 = Hoax
Backdoor.Nibu = Hoax
A closer look revealed that in other cases either
1. a variant of a virus was a hoax,and/or
2. the "deleted" definition had been replaced by ;
a. a renamed definition,or
b. an improved/updated detection "engine"
As for the subject line of this post, I don't see why you bother ranting
about "proof" when Norton publishes the "proof" in every release note, and
freely available for those interested them.