Your claim was the Houthi's can hit the Cape of Good Hope. Guess how far that is from Yemen. More than 3,000 miles away, so yes, your did effectively claim that. If they can't hit ships 3,000 miles away then they can't hit anything near the Cape of Good Hope.
They also aren't threatening vast parts of the Indian Ocean. Go look at how much trade goes around the horn of Africa to Australia, Singapore, Indonesia, etc. Their anti-ship missiles don't reach those routes either. Go take a look at how much ship traffic that actually is:
https://www.vox.com/2016/4/25/11503152/shipping-routes-map
I'm not underestimating Yemen. I advocate non-intervention. Had we never gotten involved with the Shah, invaded Iraq, armed Afghanistan against the Russians, then invaded it too, and not put troops there maybe the region wouldn't be as messed up and hostile.
Your claim was the Houthi's can hit the Cape of Good Hope. Guess how far that is from Yemen. More than 3,000 miles away, so yes, your did effectively claim that. If they can't hit ships 3,000 miles away then they can't hit anything near the Cape of Good Hope.
They also aren't threatening vast parts of the Indian Ocean. Go look at how much trade goes around the horn of Africa to Australia, Singapore, Indonesia, etc. Their anti-ship missiles don't reach those routes either. Go take a look at how much ship traffic that actually is: