Against this article of September 2014 when no Mirage upgrade started actually, Let me quote you an Article from May-2015, when this process already been starts in France and Two have arrived in India in April2015.
"The first two upgraded Mirage 2000 multi-role fighters arrived at their home base at Air Force Station (AFS) Gwalior, last month. The ferry trip to India from France via Greece, Egypt and Qatar, was completed in seven days, including halts."
And Upgraded Includes
"The upgraded multi-role fighter will be substantially more capable than the IAF’s existing Mirage 2000 H/TH versions and are much more than a 1:1 replacement in terms of operational capability.
Upgraded Mirage 2000 T/TIs will be able to accomplish longer-range detection across the entire spectrum, improved tactical situation awareness, longer-range weapon firing against multiple simultaneous targets,
weapon stealth and extended operating envelope with the capability to engage ground targets while countering airborne threats.
Aircraft serviceability will also be significantly improved as a result of the installation of modern digital systems and state-of-the-art weapons, along with cheaper life cycle costs (LCC)."
http://www.forceindia.net/TimelyArrival.aspx
No-where at above there is any talk of New engine (M53 P3), when it should be as it is a major update. I have no full version of this article but there are some rumors at some other forum while debating on the same article that Mr. Atul Chandra in May-2015 Air Force Magazine stated that "IAF declined this engine upgrade"
Quote
Prasun,
1) You have stated that the Mirage 2000 upgradation deal includes the engines. Upgrading them from M53-P2 to M53-P3. But in the latest edition of Force magazine - Mr Atul Chandra states that IAF has declined this engine upgrade. So which news is correct.
Unquote
Therefore, it is to be safely declares that no article on the web currently claims that the upgraded Indian Mirage2000H to a level which indian posters are talking about for sometime.
Maybe some knowledgeable person (
@Taygibay) from French side can shed light on it on PDF.