Park Tool MT-40 with 11 speed chain
There are chain tools out there (for Shimano/SRAM) which are recommended for 10 speed but not 11 speed (and Campagnolo needs a 11 speed chain tool for peening); Pedros makes at least one which they specifically mark this way (the ICM Multi Tool). The problem with using a chain tool not designed for 11 speed might be due to the dimensions of the rivets and how tight they are in there, the chain tool may warp the plates on the chain when putting in the new pin. 

I'd suggest emailing Park Tool to ask, but I'd think they put 10 speed there for a reason.