So your knowledge came from this video, not real life experience? Lol.
I can record a video that's completely opposite from this. How about making a bet? Says a hundred bucks?
FYI, that kind of problem is most likely come from his Clock app had crashed or something. Don't think it has anything to do with SIRI.
For other problems he had, looks like his phone also had microphone problem. Exchange it most likely solves.
PS. OK, here it is
Short and sweet, isn't it? (This video is real-time, no speed adjustment whatsoever)
You do know that Apple product come with a free 1 year warranty right? If something didn't work for you, just have them fix it.
(Too bad I didn't record sound so you could hear how bad my thick accent is)
You still don't believe me? These are my videos - recorded just for you, by me. The clock app works, as i use it to set timers manually. The microphone works great - look how well the Google app translated. So, go ahead and send me the hundred bucks, i guess, though I'm not sure what we bet on.