I would say not likely. I've not known a single Motorola accessory that states compatibility with certain devices to work with anything but those devices. For $26, it might be worth a go, though, considering the bluetooth alternatives that DO work are in the $50-70 range.
I use an Apple Wireless (bluetooth) keyboard with my PS3, and it works perfectly. I got it on sale from the Apple store for $40 a few months ago (originally bought it for my iPad).
What about this one?
That one looks to be universal bluetooth. It should work well once you pair it up.
I dont know if you can connect a keyboard to you PS3 wirelesly you can get a usb hub for like 10 bucks and get a cheap working usb keyboard for like 5 bucks or if you have had a pc for the past 5 years and you are smart and save your stuff you should have one somewhere