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Maybe, maybe not. There could be potential ultra-long-period impactors that share a similar origin, and therefore a similar period. Or perhaps crossing the galactic orbital plane changes the odds. The question of periodicity of mass extinctions (and what, if any, causes there are) is a valid line of inquiry, although there are no clear smoking guns.

https://www.theatlantic.com/science/archive/2015/11/the-next...

Oh, the asteroids, they remember. They remember and they do not forgive!

If you're interested, the terminology is "independent" events, and you're correct.

Independence is not exactly the same as memoryless. In this case I was referring to something like a Poisson process.

I suppose like flipping a number of heads in a row to get a coin "ready for tails".