If we're going to get technical and literal here, by your definition he ain't a thrower until he actually attempts to make the throw in pass. Until I see a case play, interp, or rule change that clearly delineates the thrower as the person with the ball on an end-line throw-in for purposes of the rule in question, I'm considering them all throwers and fouls committed against them on the OOB side of that plane will be considered intentional.

It seems to me the rule is written with a spot throw-in in mind, but I could be (and have been) wrong.

It seems to me the intent is to come down hard on defenders who reach across and foul a player; splitting hairs on who's a thrower and who isn't seems a bit extreme. IMO of course.

Personally, I don't think a player needs to have the ball to attempt the throw in any more than having the ball makes him the thrower. It would be more accurate to say he's not a thrower if he throws the ball to a teammate out of bounds on this particular play.

This is starting to go in different directions.
This was a spot throw-in following a violation by Team B. The designated spot was off to the side of Team B's basket (in Team A's backcourt).
The foul was committed by a Team B player on a Team A player who was in bounds, prior to the ball being inbounded. The thrower had the ball in his possession and the official had started the 5 second count (the ball was at the disposal of the in-bounder).

Yep, happens all the time around here. Just be grateful your question was answered first. :)

We know, thus the answers you were given initially.

Strictly by the rules as written, you are correct.

I have to believe that this is how the NFHS committee intends the rule to be enforced. Therefore, they should amend the rule to note that this applies to all players from the throwing team who are OOB behind the end line during a throw-in following a goal or awarded goal.

Agreed.