Probably a lot less than 10 times. Of all the results currently up on the WCA site (this one isn't yet), there are still only 76 5bld mo3 results ever. And getting n/n multi is also rather rare. I would not be surprised if this is the first time it was ever done; I couldn't find any examples of it being done in the top half of the 5bld mo3 solvers. However, Walker Welch did manage perfection in all but his second multiBLD attempt at Cubing USA Nationals 2019 (multiBLD attempts were 12/12, 10/13).This is super impressive regardless. Probably has been pulled off less than 10 times in WCA history, I would guess.
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