www.lesswrong.com/posts/L8YFcCw5ex3qjLyoJ/outrunning-your-headlights

The footnote appears to be referring to dissociative fugue, but the description given does not match how DSM-5-based sources define it.

Public medical references describing DSM-5 say dissociative fugue is a type/specifier of dissociative amnesia involving purposeful travel or bewildered wandering together with amnesia for identity or other important autobiographical information. Merck Manual similarly explains that in dissociative fugue people lose some or all memories of their past and personal identity and typically disappear from their usual environments, sometimes traveling far from home or assuming a new identity.

By contrast, the post's wording says the DSM condition is about "sudden awakening followed by distress and retrograde amnesia for one's own identity." That leaves out the defining fugue feature of wandering/travel and replaces it with "sudden awakening," which is not the core DSM-5 description. Distress can occur when the fugue ends, but it is not the defining description of the diagnosis/specifier.

So the claim is incorrect because it attributes a DSM description that does not match the condition's actual DSM-5-based characterization.