I'm not a scientist either, but any thinking person would also think C-14 would be everywhere, not just in Japan's cedar trees.
Besides, I thought C-14 had a constant decay rate and now they are saying it can be added after every stellar event? That would seem to change numbers everywhere and skew all kinds of numbers.
We KNOW the dates of some events because it is in recorded history. If we have stellar events between then and now, it looks like we could Measure C-14 from that period to check to see if there was a date skew in the measurements.
I think someone is looking for grant money instead of a job.
I'm not a scientist either, but any thinking person would also think C-14 would be everywhere...and, that's exhibit A into why you're not a scientist, or have any interest in becoming one.