Yes, that indeed is a mystery...
The point is moot however because
@Maurile Tremblay recently said in another thread (unless I misunderstood him) that alias accounts are now acceptable and you can post under two or more handles simultaneously, provided one of them is not banned or suspended. Bozeman (or whatever he goes by) was posting under two accounts and that was deemed OK since neither was under suspension.
If actually I did misunderstand Maurile, I wish he or another mod would clarify this as IMHO it seems contrary to prior forum policy.