He most definitely says it's an easy method (1:12) and never says it is difficult.I don't see it that way. The liquid all over his hands was most certainly not a figment of my imagination.
If the process to simply fill a vessel with fluid requires you to type up an itemized list with 8 bullet points and countless instructional videos on youtube to be posted, it has left the realm of simple and easy. I never had to watch a video to fill an Aerotank or an Ego One; never needed an itemized list to figure out how to light a cigarette - that's because those things are actually simple and easy.
Never a drop of liquid spilt in my experience...but take it or leave it, it was meant to help not argue over.