When did Blizzard ever say she wasnt though? Although I am not sure Blizzard used the term Garrosh 2.0 they did state, as I mentioned before in a Q&A lore panel at Blizzcon, 2 years back(?), that when asked by an audience member that 'is Sylvanas becoming like Garrosh' one of the writers replied that Sylvanas see's Garrosh as an amateur in comparison to her'. Thats all we got.
If you can find anything that says otherwise I haven't heard it, so please share :P