I know that it makes the only teeniest, smallest of differences (a few hundred gallons taken from billions of gallons), but could that phrase be proved wrong?

Thanks in advance!

Note: I put this on the Earth Science SE because I couldn't find anywhere else it would fit.

• The Earth's atmosphere is leaking gas to space. This includes mostly hydrogen gas, which is a major component of water, and also some minor amounts of molecular water.
• Earth is gaining water (and a bunch of other stuff) from meteorites and dust hitting the Earth. Dust accounts for the majority of the mass flux to the Earth.
• The Earth's surface and atmosphere are getting huge amount of water from volcanic eruptions. H₂O is the major component of volcanic gas in most volcanic eruptions.
• Earth is losing water to the mantle in subduction zones and in lithified sediments.

All of these water mass fluxes are orders of magnitude larger than the amount of water carried to the international space station. It's like asking whether you can deplete a beach from sand by taking single sand grains out of it, when you're gaining and lose huge amounts of sand by ocean wave action.