Those are good counterexamples (though the Hotenow thing doesn't seem like a big deal to me; "some fifty years ago" in Icespire Peak is off by almost twenty years, but it's explicitly an approximation, hence the "some").And here I was sure you were going to mention the retconned timeline for H4 Throne of Bloodstone.
That said, the 5E lore has had a few issues, such as Storm King's Thunder apparently forgetting that only members of the Shanat bloodline can use the Wyrmskull Throne (as established in the appropriately-named 2E adventure, Wyrmskull Throne). There's also the apparent misdating of when Mount Hotenow erupted in the Sword Coast Adventurer's Guide (which is discussed more over here). But overall I agree that the lore for the 5E Realms isn't necessarily a mess per se...though I likewise agree that it has a lot to do with the comparative dearth of materials.
There are also other minor timeline problems in the 5e lore that result from WotC's new policy to avoid explicitly dating adventures—the idea being that players might not want to move on to an adventure that precedes the one they just finished, and this undermines WotC's current approach, where they want every D&D adventure to be an evergreen product perpetually in print.
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