Princeton v Harvard -- one game Ivy playoff

[Nevadaref]

Following Harvard's basket with 11.1 remaining, did the Princeton thrower step INBOUNDS while attempting to execute his throw-in?
It is hard for me to tell from the ESPN video. He may have only stepped on the OOB line, but it is darn close.
Considering that Princeton scored at the buzzer on that final possession to claim the conference's automatic NCAA tournament bid, this is a big call.
Also we recall the NCAA memos from a couple of years ago stressing to look for this and to call it even if there is no pressure. The instruction was that it is not a judgment call.

Note: I have no rooting interest in this game. I simply noticed this while viewing the highlights and grasped the importance of this violation decision.