Oooof! That site knows rather less than it thinks it does, Azizi (of course you're forgiven, how could I not?! :) ). The lute is not the forerunner (true or otherwise) of the guitar, any more than the rebec is the forerunner of the violin (so there's another one for you to go & look up ;-) ). And the Roman instruments are not directly related to the medieval ones.

And yes, I do play the lute, also the guitar. Both fairly badly, these days!