No, bitlocker explicitly send the key to MS for non-domain systems - as such, I would guess it potentially still does for those on a domain too, it'd just be kept quieter.
So you know that if you click 'no', it definitely isn't sent anyway (perhaps with some "MS/NSA use only" bit set to distinguish it from user-accessible ones)?
The very ability to send it to MS is worrying; doing it automatically is more so. If they were honest about the key, it'd say "put this on a flash drive/hardcopy in a safe deposit box".
Your link says "There are several locations in which your BitLocker recovery key might have been saved." and then mentions "Your Microsoft account online.". Do you know under which conditions this happens?
http://windows.microsoft.com/en-us/windows-8/bitlocker-recov...
Bitlocker is not trustworthy as an overall method of FDE.