The same arguments were thrashed out when the '80s Biturbo was launched: not a real Maserati, looks like a Fiat Mirafiori, etc. Whatever the Biturbo's shortcomings, and it had many, at least it allowed for the survival of the marque.
I don't think they have a snowball-in-****'s (bizarre, why is the opposite of 'heaven' being censored?) chance of hitting those targets but they are right to go for bigger volumes. The brand can not be financially viable producing a few thousand here and a few thousand there. It will cease to be.
Jaguar have done a remarkable job turning around their brand with the XF and now the XJ. Maserati are right to pay close attention to how they did it. However I don't see them being directly comparable. A quick look at the classifieds shows dozens and dozens of XFs with well over 100,000 miles on young cars. They are obviously been bought by middle managers who pound the motorways. Is that really Maserati's territory?