I agree with the consensus.
There are 18 seconds left. We have two timeouts, they have zero.
You call a timeout and instruct your team, with the goal of shooting with around 2 to 4 seconds left, with hopes of getting an offensive rebound. If you make the basket, Philly isn't going to get a shot off without a timeout.
And, with a timeout, we could have given Philly a different offensive look. Maybe bring in Timelord or Brogdon so that Philly has to worry about other plays than a straight drive or three pointer.
(Why didn't Brogdon play the last 4 minutes of OT? Or am I misremembering?)