No. A max th9 with nested AD, xbows up, and maxed AD traps can do a pretty good job beating back a balloon attack. Throw in centralized Cc full of wizzies and he should be able stop a 2 star easily.
Even attacking th10 in cupping you try to avoid the core. You usually just aim for a 1 star. A much weaker army then GOWIWI.
But lets get serious, any decent th10 player can 2 star a th9 with most armies if they are using 3-4 spells and mid level heros.

