From the link you provided...
Seems Remington agrees with me...

“Remington response:
Response (Ron) - 06/11/2007 11:13 AM
Dear William,

Thanks for contacting Remington Country. Yea you can use steel shot in the 2
3/4 shotgun, Remington only recommends not shooting steel in extra full choke
tubes or choke tubes marked lead shot only. If you use Improved, Modified or
full choke tubes they only state not to use larger then #2 steel shot in the
full choke tube.”

Remingtons second response:

“Dear William,

Thanks again for contacting Remington Country. I addressed your question this
way because you did not say what choke your barrel was, this way you have a
complete answer on all the chokes.