cdo.wikipedia.org/wiki/T%C3%A0u_Hi%C4%95k

The quoted text says Goguryeo "was destroyed by Silla" in 668. That is too narrow and historically incorrect.

Credible reference works and official Korean history materials describe Goguryeo's fall as the result of a Silla–Tang alliance, not Silla acting by itself:

• A History of Korea (published by the National Institute of Korean History) states: "668 Goguryeo is toppled by the Silla-Tang allied forces."
• Korea.net's official historical overview likewise says Goguryeo fell in 668 after the Silla-Tang forces attacked it.

So the error is not the year 668, but attributing Goguryeo's destruction to Silla alone rather than to the joint Silla–Tang campaign.

The passage says Baekje "was destroyed by Silla" in 660. The date is right, but the attribution is incomplete and incorrect.

Official and standard historical sources state that Baekje fell to the combined armies of Silla and Tang China:

• Korea.net's official history summary says: "Finally, Baekje surrendered to the Silla-Tang forces in 660."
• A History of Korea from the National Institute of Korean History states: "660 Baekje is toppled by the Silla-Tang allied forces."

Because the conquest was carried out by the Silla–Tang alliance, saying Baekje was destroyed by Silla alone misstates who actually defeated the kingdom.