I think the article was pretty clear and concise actually
"The blast was small, and satellite imagery of the airport taken immediately before and after the blast is not detailed enough to capture the crater from the impact, the analysts said.But it does show ground damage from the emergency vehicles, supporting the finding that the warhead hit just off the runway.While the Houthis missed their target, Mr. Lewis said, they got close enough to show that their missiles can reach it and can evade Saudi defenses. “A kilometer is a pretty normal miss rate for a Scud,” he said."
Also the reason for the failure to intercept isnt because of some "fluke" or "lucky shot" on the part of the houthis its because of the range limitations and attack method of the patriot interceptor itself.Frankly I wouldnt be at all surprised if virtually all of the saudi intercepts failed and most of the warheads got thru,tho whether they actually did any damage is another issue however,but then its not like I`d be so stupid as to rely on the reporting of the saudi media for the imformation anyway.The big problem for the houthis is the fact that they either cant or wont use their missiles en masse as they are supposed to be used,because without that you`re really limited to pin pricks,altho one possible option would be the use of cluster munition warheads.
The tochka is a completely different type of weapon,its designed to be a short ranged battlefield missile with pretty good accuracy but very short range,70km for the A model,so I`m not surprised it was able to hit a military base,in addition these bases by their very nature do tend to be crammed with personnel and weapons so a successful strike often has quite spectacular results,altho personally I wouldnt have been shocked to learn that the gulfies stored all of their hi-ex right next to the soldiers accommodations.Indeed from the sounds of it the tochka has probably been one of the most successful weapons the houthis had,tho the gulfies also claimed successful intercepts against these as well however in this case I`d be more inclined to actually believe it simply because of the limitations of the tochka itself.