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Dagobah
Located near a lagoon and a fearsome looking twisted tree in the swamps of Dagobah is a simple mud hut that housed the last known Jedi Master of old in the galaxy. It is a far cry from the towering spires of the Jedi Temple, but when the Jedi were slaughtered during the turbulent political changes that wracked the galaxy, such austerity is understandable.
Inside the hut, Yoda lived a simple existence. He had no items of technology, and instead relied on the wildnerness of Dagobah to provide him his needs. He would cook on an open fire, preparing meals from the surrounding plants, such as his rootleaf stew.
Growing near the hut is a twisted tree strong in the dark side of the Force. It is a domain of evil, though how it came to be this way is unknown. Beneath the tree's gnarled root system is a mysterious cave. When Jedi initiate Luke Skywalker entered the cave as part of his training, he experienced a chillingly surreal image.
In the dank cavern, an image of Darth Vader appeared before Luke, brandishing a lightsaber. The two dueled, their motions slow and dream-like. Skywalker succeeded in beheading the dark form. When the severed head landed at his feet, he saw its faceplate suddenly explode. There, behind the metal mask, was Luke's face. The terrifying image of Luke's possible future marked one of several failures during his training on Dagobah.
ORIGINAL SITE www.starwars.com databank yodas hut
They mean in the database that he didn't live on technology...that doesn't mean he lost it...besides the database can't know the details yet...they would be spoilers. There are no details yet about the fight of Anakin and Obi-Wan either, just that Obi-Wan defeats him. How Obi-Wan got Anakin's lightsaber is not mentioned, cause they don't know it.
But did he have to make a new one? There is no proof that he lost it...The database tries to point out that he didn't live on technology...when this text was written, they probably didn't even know if he still had it or not....they could not even know if he had a lightsaber in the first place if this text was written before the prequels or before ep II