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Proxima Cent is a very old and very active flare star,possibly been around well before our sun was born and will be around long after our sun is reduced to a white dwarf,planetary nebula.That proxima b is twenty times closer to proxima A than Mercury is to our sun and would have been receiving flares of various magnitudes for billions of years.
The large ones are not unusual and are probably quite prevalent, that we have spotted one only adds more data against any "life" on Proxima b
Proxima b is like our moon tidily locked to Proxima A, so the face pointing proxima A would have had maybe many millions of flares battering its surface over it's life time.
I reckon you can strike Proxima b of your list.
Cheers
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