I'm sorry, did you claim poor tuning?
look at this graph: https://alvinalexander.com/sites/default/files/inline-images...
from: https://alvinalexander.com/scala/graalvm-native-executables-...
look at this graph: https://alvinalexander.com/sites/default/files/inline-images...
from: https://alvinalexander.com/scala/graalvm-native-executables-...
Obviously I don't have their dataset, so it's not exactly the same test.
edit: In fact the numbers in the blog are so far off mine they may accidently have been testing /usr/bin/find.