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Hi there -
If the spoiler sticks up higher than a line extended from the existing curvature of the roof, it probably increases drag.
The Swift GT in North America (same body style as yours) had much a very low profile spoiler (more of a roof extension, really). One of our members here claimed after doing "max velocity" downhill runs that it reduced drag vs. no spoiler at all.
But even the unadorned hatchbacks have an integrated "lip spoiler" above the glass (integrated in the window trim).
I'd like to see that spoiler in profile before making a call, but I suspect it's something I'd remove, personally. You can always put metal tape over the holes or put bolts back in, then reinstall it later if you want to (eg. when selling).
Welcome to the forum, by the way. I saw your intro post but haven't had a chance to say hello yet.
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