Yes, Kingda Ka is obviously rusting because it is at a Six Flags park. This is the most logical explanation...
It's not like TTD gets a new coat of paint every year.
Haha! One of the comments for that video reads as follows:
"that freakin fatass mullet redneck, i cant even tell if its a guy or a girl pokemon is sooooooo gay it should be wiped off the face of the earth"