i also had a close look at some of the frames they make and they dont look like that so i would be pushing for a new one , as for the its not a car comment very unprofessional imo
Nope i would not be happy with that at all , looks like thay have a problem with the die its formed in, or its not been put under enough pressure to force the aluminium in to the die ,either way thats not right ,buts thats only my opinion
hope you get this sorted out
Shimano slx does a 220 rotor
https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/products/cg2SHICComponent/cg3SHICDiscBrakeRotor/cg4SHICDiscBrakeRotor/P-SM-RT66_2013products0382.jpg/jcr:content/renditions/P-SM-RT66_2013products0382_750_750.jpeg
model number SM-RT66
series...
I remember reading reviews on the stumpjumper a few years back when i was looking to buy one and this very fault popped up on a few reviews , the pics looked exactly like yours ,stopped me buying one
do a bit of digging on the net and you will probably still find them