Appreciate the effort to make a post. Limping could totally be ok yeah.
GTO wizard wants to limp T9s about 27% of the time at 30bb deep.
At 35bb it raises 100% of the time.
Still preflop we have some equity vs big hands like AJ-AK,KQ,KJ,A5. It also plays well vs a flatting range.
I was thinking he might do this with gutshot+overcard or oesd, but combined with nutted hands it might not be so good still.