No no you may be misunderstanding. The quote you point out is in reference to why it is a defensive TD and not a special teams TD. Most leagues score D and SP teams together. Some award points for return yards on special teams and some award points for return yards on D. This play should have counted as a defensive TD, with defensive return yards. It had nothing to do with special teams.
One league I play in awards points for defensive return yardage. IE a ball gets intercepted and returned 50 yards, we get points for the score and 50 yards for our defense. Same for a fumble recovery. It is not a part of yards against. If he is in a league that scores like this (I don't know if Yahoo even can) then his question wasn't fully answered.
Hope that helps because the wording of your question makes it hard to understand which aspect of scoring you are concerned over.
My Playoff Team - Please Comment
MSchaub, DMcNabb, JFreeman, KKolb
SJackson, THightower, CWells, JForsett, JSnelling, CJennings, QGanther
RWayne, RMoss, RMeachem, MCrabtree, DBowe