The image promotes worship of flat earth. The level is totally out of proportion to the figure of Christ and dominates Him. It is not Our Lord who is portrayed as the center of attention in the picture.
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While it's true that IRL the level is way too big, since this concrete statue of Christ the Redeemer in Rio de Janeiro is 92 feet wide, still, if it were full size, we do have 8-foot levels in common use these days so that's not entirely deceptive (although the scale is off since the vials would not be that large if it were an 8' level).
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Picture of an 8-foot level:
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Notice how much smaller the vials appear, but they are the same size as the ones in the OP.