Sub not in game for disqualified player

[Nevadaref]

Originally Posted by Snaqwells

Nevada, I think he's saying when a player is disqualified, the opposing coach can also use that time for a de facto TO, without the responsibility of sending a sub to the table.

Yeah, but I think that he is also trying to justify the lack of imposing a penalty upon the team with the fouled-out player being late with their substitution by stating that all is equal because the opposing coach can also talk with his players during this time.
That's not the point of the 20-second limit nor is it how the NFHS wants this to work. The idea is to keep the game moving.