Delay on end line

[shishstripes]

You are correct it should not have been a spot throw-in.

7-5-7b A team retains the privilege if the scoring team commits a violation or common foul and the ensuing throw-in spot would have been on the end line.

It is a violation when 9-2-10 The opponent(s) of the thrower shall not have any part of his/her person through the inbounds side of the throw-in plane...The first violation shall result in a team warning for delay (unless a delay warning has been already issued to the team), the second will result in a technical foul (for any delay).