Could well be. In English, to dwarf something is to make it look small or insignificant by comparison.
I’m not sure if they standardized the contracts precisely so that they would be more liquid; they probably did so to make the job of the clearinghouse easier. Higher liquidity and volume is just a nice byproduct.
And it may well be that FX forwards and swaps have a (much) higher volume than FX futures; it wouldn’t surprise me that most companies that use them have very specific needs for which standardized contracts would be unsuitable.