By the way, that's 75 to 100% figure you're citing is I think a significant misinterpretation. I think you may have read about benign lesions that occur after many cardiac procedures and are clinically insignificant, especially with newer valves and procedures. I mean, I was worried about this too, but when I talked to the Clinical Fellow who visited me just before the procedure, he noted that just a great many people have these lesions as they age. And it's true:

Silent cerebral lesions (SCLs) are detectable by sensitive MRI in many older adults, without cardiac procedures, such as TAVR.
https://www.ahajournals.org/doi/10.1161/01.str.0000052631.98405.15