It's either just plain lazy, or he thought this ship looked "cooler" than one of ours, or one of his staff did. I looked on his Twitter just now and it's gone.
On the link Takao provided, the picture has the stern cut off, not this pic at the top of the thread.
There's a popup that shows up on military-related websites about "China's New Warship" with a photo of a British Daring class destroyer.....
Even experts can screw the pooch. In Jane's History of War at Sea there is a picture of Lexington with a flight deck full of biplanes. The caption reads (from memory) "USS Lexington in WWII."
I also noticed that the hull pennant number as and name have been edited out. Humorous that the Russian flag was left intact. Aparrently, the edited image is from Shutterstock.