A possible concise summary is:
The speaker is a film theorist who claims that Dory from Finding Nemo and Finding Dory is faking her short-term memory loss. He presents various scientific and logical arguments to support his theory, such as Dory's inconsistent and exaggerated behavior, her species' characteristics, and the causes of anterograde amnesia. He challenges the audience to tweet his video to Ellen DeGeneres, the voice actor of Dory, and also promotes another YouTube channel that he likes.
Here are some key facts extracted from the text:
1. Dory is a blue tang fish that has venomous glands and a caudal spine.
2. Dory claims to have hereditary short-term memory loss, but there is no scientific evidence for such a condition.
3. Dory shows signs of malingering, or faking her symptoms, such as exaggerating her errors, delaying her responses, and recalling information in accordance with the primacy effect.
4. The video suggests that Dory is a con artist who manipulated Marlin into helping her and letting her into his home.
5. The video is a film theory by MatPat, who also did a video on Leonardo DiCaprio and the Oscars.
6. The video encourages viewers to tweet at Ellen DeGeneres, the voice actor of Dory, with the hashtag #exposingdory.
7. The video also promotes another channel called Wisecrack, which did a video on Deadpool.