Did he? To my knowledge he only said we need to fight "Islamic radicalism" or something of the like. Saudi Arabia is Wahhabist, it doesn't get any more extreme. So selling weapons to the most extremist country on Earth is generally a poor way to fight for human rights. Every President said we need to fight radical Islam. It means nothing unless you back it up with something.

The problem is he isn't punishing anyone for human rights violations. Cuba isn't good by any stretch, but they aren't the worst either. So if we want to punish human rights violations, why start with the 48th worst offender?

And worse yet, does cutting away diplomatic ties really do it? The best way is most likely to make trade deals and incorporate specified human rights improvements in the deal as a condition to the continued existence of the deal. Obama did such under the TPP; Brunei, Vietnam, and Malaysia all committed to serious improvements in human rights to get trade access to the US but Trump since cancelled the deal and the human rights improvements with it.