It doesn't count because it's a very drab red that blends in with or is duller than the red walls which would surround it.
While it would be entirely possible to reskin the water barrels with such a color I feel it might be a little "off" because the blue ones are a very bright saturated blue. Additionally those kind of plastic barrels rarely are made in colors other than blue, white, or black.
Lastly I'd usually say it would help the team theme asymmetry to not have a red one, and be forced to use something else the same size.