Sorry to say, I don't think it is legit.
Massive weapons reads:
At 3rd level, a titan mauler becomes skilled in the use of massive weapons looted from her titanic foes. The attack roll penalty for using weapons too large for her size is reduced by 1, and this reduction increases by 1 for every three levels beyond 3rd (to a minimum of 0). This ability replaces trap sense.
It merely reduces the penalty to attacks, but doesn't say anything about the rule that weapons of larger size are one category more unweildy. So a Large light weapon, when used by a medium character, is one handed. Thus, 2 handed weapons are bumped up to be unusable for smaller creatures.
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