Earlier quoted context omitted.
So then a Covid vaccine is also blocked by regulatory approval. I look forward to teaching my project manager this new definition.
Yes, exactly. Quite a few possibilities are being tested, as in they exist (maybe). It is quite literally being blocked by regulatory approval, with the testing for validity and safety being the approval process.
Of course not, that doesn't make sense...if your goal is a cure. (If you're peddling hope, or just looking to make money off quack medicine, OTOH...)