DC statehood requires constitutional amendment?

[Massacure]

4. Whoever said that probably doesn't fully understand what the Constitution says

From Article 1, Section 8:

The Congress shall have Power To… exercise exclusive Legislation in all Cases whatsoever, over such Dis­trict (not exceeding ten Miles square) as may, by Cession of particular States, and the Acceptance of Con­gress, become the Seat of the Gov­ernment of the United States…

The federal government has the right to exclusive jurisdiction, but that doesn't mean they need to exercise it. They could hypothetically move the capitol back to Philadelphia if they really wanted to, if they were content with the capitol being under the jurisdiction of Pennsylvania.