The oaks came from what is now the Netherlands and Germany, as stated in the excerpt, but yeah, the Romans shipped enormous cargoes in what may have been the largest wooden craft ever built and used on a routine basis. The great ship built during the reign of Caligula, to carry a 300+ ton obelisk to Rome from Egypt, was moored for some years thereafter, until used as a concrete form to build the mole in Claudius’ new all-weather port in Ostia.
The remains of that ship (or a very nice mold of the interior structures) probably can still be found via excavation, and the port of Claudius silted up long ago and is a mile or so inland.
Very interesting how sophisticated their lumber distribution was. That is a very bulky product.