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Magma very well contains as much ability to destroy the world as earthquakes. Considering that WB's largest destructive Quakes couldn't even destroy the entirety of the main Marine building on Marineford, it's safe to say that Gura destroying the world is hyperbolic.
Because Teach isn't gonna hype up his own fruit? Enel's fruit was also stated to be invincible and all-powerful, yet he lost to someone with better fighting ability(yeah rubber played a good role) and Oda confirmed there are tons of people in the Blue Sea(not even just the New World, the Blue Sea as a whole) who could wipe the floor with Enel despite these highly destructive statements of hype surrounding his fruit.
Not to say that Enel is comparable to Teach in strength, but the same principle applies: Devil Fruits aren't the end-all-be-all of what constitutes power, just one aspect. Can't just ignore resiliency, speed, endurance, and physical strength.