How many airlines really reinforce the High Speed/Low Speed Regime decision making process in their training?
In the High Speed Regime (above 100kts usually) an RTO should only be carried out for Engine Failure/Fire or any indication which would strongly indicate the a/c is unable to fly (e.g. Config Warn).
Perhaps the engine failed after the birdstrike, in which case they did the right thing.
If there was no engine failure or fire indication a bang alone would not require an RTO if they were over 100kts.
Especially on a 4 engined a/c.