While by no mean I want to start a flame war, I think that I've understood what he means.
You might need a check-up, when you start understanding frankish it's not a good sign.
His point is that LN acts like a hose. It doesn't care if it will transport water (bitcoin), oil (name your altcoin) or even air (if it's tight). It will work the same, depending on where it's plugged.
More like a submerged hose that at both ends communicates in the same pool, since there is no difference between me opening a channel paying you and you closing it and re-entering the blockchain and me sending directly those coins to you on-chain. The coins are still there, they have never left the pool and can't leave the pool and more importantly, coins entering the circle don't even have to go to the other end.
At the moment the hose is plugged to 2 holes of a water pipe, it's a water hose. So... why argue for tiny details?!
Because he claims that water entering the hose turns into piss, that's why
