svellsongur copys defflet texto from Ornn Forge God?

Yes. Svellsongur copies Ornn's printed text — including his Deflect 2 — into its own effect text while attached (FAQ #8608).

Since the equipment's effect text is active and appended to the unit's rules text, Ornn ends up with two instances of Deflect 2, which stack into Deflect 4 (Rule 809.2). So opponents must pay 4 any-domain power to target Ornn with a spell or ability.

One nuance: Svellsongur only copies printed text — not text granted by other attached gear (e.g., Forgefire Cape) or temporary effects. But Deflect 2 is printed on Ornn, so this copy works.