No, that was just a coincidence.
The problem was that fingerprint unlock stopped working (for whatever reason) and, because his phone was in airplane mode, he could not use any of various tools to remotely unlock it.
Having said that, I agree with other posters here that he should have been able to turn airplane mode off simply by dragging down from the top of the lockscreen.
As to the other posters who do not have see Samsung Find My Mobile, I think that is because they never setup a Samsung account and linked it to the device.