One of the perpetrators of the Riyadh bombings was said to be Khalid ibn Muslim al-Arawi al-Juhani, aka Khalid ibn Mohammed al-Jehanni. If the Saudis are now saying that he's alive, then either somebody resurrected him or we have yet another contradiction from the Saudis.
Also, per ganeshpuri89, the Saudis have threatened al-Ghamdi's family if he didn't surrender:
Now that I have time to look at this article, this guy - Ali Abd al-Rahman al-Faqasi al-Ghamdi - appears to be the same one reportedly captured back in late May: