WOD old raid soloing...what about pruning?

i have seen many of the blue posts on how existing abilities to solo older raids after SQUISH would be preserved comments like:

There will be special handling in place for players to retain the ability to solo older raid content. Players will deal bonus damage against and take reduced damage from lower-level creatures from past expansions. (Rygarius)

the item squish *will not* make soloing old raids harder. We promise, and 110% guarantee it.
- Celestalon (@Celestalon) February 9, 2014

Raids you were able to solo pre-item squish, you will still be able to solo just as easily post item squish. and more along these lines with terms like "rest assured"

with this level-85, i ran a low level player thru BT yesterday, 4 bosses i use blood spec and on two i use necrotic strike (NS). this ability is getting pruned in WOD from my tanking spec. when i got to council bosses in BT i normally keep NS up on lady malande, i did a test in the middle of the fight and stopped using NS and did not use it anymore, she healed them enough to eventually wear my DK down and i died. in the second fight i used NS the whole fight and cleared them as usual. the earlier essence of desire boss phase i also use NS, to reduce her healing while being CC'd alot. if i don't use it, which i learned in the past, my player gets wiped and her heals are unstoppable while chain CC'd

basicly i can solo BT now, saw no issues with squish, believe that pruning of key abilities will negate the assurances made.