Yes, the same producer, though I understand there's been a geographical movement in recent times (some vineyards bought, others sold). If the free content is still on winepros.com.au (in fact if the site is even still there!) then they'll have James Hallidays overview of the winery.
Of other French producers, Domaine Chandon in the Yarra are pretty big (Green Point is their big brand).
Dominique Portet spent years at Taltarni and now has his own winery in Heathcote (The shiraz is worth trying if you see it).
I know there's others (Francois "Franky" Jacquard springs to mind), in fact there's a book by John Beeston called a concise history of Australian wine, which (I recall) also charts the involvement of the French since the early colonial days (Velmai Henkel also wrote some similar - and fantastic - articles in Winestate, which almost made up for the rest of the magazine!).
Oh and then there's the Germans, Austrians, Serbs, Croats, not to mention the Italians et al. You don't think the English could foster a great wine industry do you
Hope this is of interest