I can't vouch for Uemuras translation in that document, but it is possible that the original author meant "clear, transparant", and not "colorless, water-white".
Analytically pure MDP2P still has a very faint yellow color, much like a post-it which has been exposed to sunlight a while.
MDP2P has an *odor* if you sniff really close, but you could have an opened bottle of it in your living room without anyone noticing, as it doesn't smell up everything. Perhaps that was the original meaning?