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This isn't really a question, more of an observation to confirm reading.

But plaguebearers, and the other daemons, from Codex Death Guard are not actually Death Guard.

This codex defines a Death Guard detachment as one that contains only Death Guard units.

This means that an army of one detachment consisting solely of units chosen from Codex Death Guard, so long as it includes one of those units, is not a Death Guard detachment, and cannot make use of any Stratagems or Inexorable Advance contained therein.

Correct?

Just kind of strange that all the contents of a codex are not their own faction.

Yes correct.

They're in there for summoning purposes via Daemonic Ritual.

Nurglings specifically are in there for a better datasheet for Nurgle Daemons players to use.

It's common belief that Plaguebearers, etc. are in Codex Death Guard so you can use the Daemonic Ritual rule and summon these units without needing another codex.