Do you mean that it looks like they are going to be using a washing machine drain - type of setup? As in, large diameter pipe with a smaller flexible tube that just slides into the larger pipe by a healthy amount? I thought about doing that, but as it is going to be sealed up in a wall I think...
Mounted one Mr. Cool DIY 9k Wall Mounted Air Handler on an exterior wall, but with soffit the actual distance from daylight is about one inch shorter than the built in drain line. This makes the connection point for the drain line extension they send with the unit happen almost inside the wall...