I disagree. Technically you are absolutely right of course, but when we are keeping in mind all users that do not know chemistry or its nomenclature, is it not harmless simplification to in a way pretend that that is the case: that they are opposites? N,N-DMT and 5-MeO-DMT are the two most common in the 'DMT family', ignoring the 4-substituted ones for now since they are used quite differently (usually not smoked, not a short duration). For some reason occasionally people may call 5-MeO-DMT "DMT", for example when it is the only simple dialkyltryptamine they have ever used and they actually mean "the DMT" as in "the compound belonging to the family of DMT analogues". That is why I think it is best that whenever N,N-DMT and 5-MeO-DMT are involved, the N,N is used to confirm that the unsubstituted DMT is meant. This works because people don't say 5-MeO-N,N-DMT often at all, virtually never.
So I'd rather keep it clear which compound is meant even if that means risking that people make the wrong assumption about 5-MeO-DMT not having the methyls on N,N. That is hardly a functional fact.
Perhaps it's a matter of personal opinion but after having had discussions with people about the two compounds I quickly grew tired of getting miscommunication or confusion.
Including 5-MeO-N,N-DMT in the title is also not something I'd like to do because even with a chem background it confuses me for a fraction of a second and reminds me too much of a formula like 2,N,N-TMT. Recognition is better IMO.
You're welcome to explain your own opinion about this but please consider more than perfect use of nomenclature, this is not a scientific article. Clarity for novices is important.