Do you still get experience entering a dungeon without duty finder?

[Allyrion]

Wrong, wrong wrong... there is ZERO experience for level 50 duties if you're not in duty finder. Please refer to the following quote from the preliminary patch notes.Emboldened for emphasis.

So, no. if you're in roulette you'll get experience. If you're not, you won't. Simple as that.

That's only for post-50, non-HW dungeons. Probably not what people are talking about here since they're talking about desyncing level.
This topic is only relevant for pre-50 content, really.