Originally Posted by dsf
...does this mean (...) I'd make AA Platinum before even leaving Europe?
Yes.
Edited to add: but do note that it might not be the best way to do it. If you do WAW-LHR-SYD instead, you will not be PLT until you get to Sydney, BUT, the 100% bonus will be much bigger (DXB-LHR vs LHR-SYD).