Olave did NOT run his route and that allowed the Defense to take Carr's primary look away.
Watch the defenders I circled.
This next frame is at the end of Carr's 3 step drop:
Here you can clearly see Olave has already begin to jog. Hill is almost 2 yards more downfield. The Nickleback and safety both read there is no deep threat and stop back pedaling to flatten out their technique.
On this next frame you can see the Left tackle has been beaten inside and is about to crush the QB, and the the second level defender under cuts Hill's route taking the throw away so Carr has to try it away to avoid a sack at the goal line.
Olave is clearly loafing, but I think the Defense anticipated this route, and even though Olave was not in the read progression, had he run his route here, I think Carr throws him a 50/50 ball instead of taking a sack.
Carr has plenty of fault in the offense underperforming, but that is absolutely no excuse for Olave consistently giving up on his routes and not selling his clear-outs.