When I decided to redo whole suspension on my 4.6is at 106k miles (IIRC), I discovered that one of the front strut mounts had considerable cracks in it.
Of course, it's not the same as mine had struts vs the air ride and crack was in strut mount rubber and not in shock tower.
But, it may have something to do with 20" heavy wheels and not much rubber to cushion plus if the PO hit the bad pothole with already tired or blown strut / airbag, I'd say it's very possible.

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2010 BMW M6 * Black Saphire Metallic * Full Black Merino Leather
2019 BMW X3 M40i * Alpine White * Mocha Leather