Performance in MOOCS (or any educational setting) != Intelligence or ability to perform
especially when the educational setting has an incentive to increase their performance metrics (not the same as standards)
Call that what you will.
I am confused about what you consider "ability to perform". Education is a context for performance.
The problem is that memorizing an x digit number is proven to be trainable, without much carry over to g or even other working memory tasks. I.e. - it's hard to train fluid intelligence rather than train the specific task which it is applied to.