You answered your own question with the link. Yes.
This is key:
External power supply
That being said, it is not generally recommended. If you do so, you will want to create multiple partitions. What will you be backing up to TM? it is recommended to have atleast 2X capacity of your TM volume relative to what you are backing up.
3 TB of your data will need to be excluded from your TM backup (itunes, aperture files). If the disk fails, you will lose your native volume's backup, and your iTunes library. Keep this in mind.
It is supported, yes. It is a stable or recommended configuration, no.
nbar: I am not prepared to do RAID right now, I know about it, my data is important, but it's just not going to happen. I am looking at another LaCie product which allows for RAID with slows that allow HDDs to be inserted like slices of bread in a toaster, Thunderbolt complaint also, but not yet.
For now I have a surge protector and am looking into getting a UPS. Backing up to a TC has failed in the past, HDDs have failed, but that's life, one dat everything will go into the cloud.
I intended on creating partitians, sorry, I forgot to mention that. I was only going to do a 1:1, my iMac has 1TB capacity, so I only thought of giving Time Machine a 1TB partition, but on reflection maybe you're right, I could half it and use another HDD for the Aperture backup.
Okay, so that's 2TB for iTunes and Time Machine a paiece, so problem.
Rudegar: Bottle necking is an issue, but it's not an SSD, just a HDD, I don't need speed of access, streaming music and backing up at the same time isn't that costly in data transfer.