This is actually a statement and not a question. If I'm reading this
right, the statement says that when repotting it's important to trim
off dead roots from the bottom and put most of the roots in the medium.
I'd have to agree with that in general.

The main reason to keep some aerial roots outside the medium is if they
are large, healthy and don't want to go into the pot such than forcing
them might damage them or require truncating them substantially. In
such cases, it's probably wiser to leave them outside.

-M