The
website does not refer to these changes (yet):
Get your year off to a flying start – make your Level Miles go further by carrying them forward for renewed Platinum membership. Instead of resetting your Miles balance to zero, Platinum Extended gives you a boost by topping up your Miles balance with every Level Mile you have earned beyond the 115,000 Level Miles threshold.*
* Except for French residents, where the required total is 150,000 Level Miles or 105 one-way flight segments.
My guess is that it is probably a mistake.