It's seems that the company which owns "Paul" voice preset and DECtalk now is SpeechFX:

http://www.speechfxinc.com/dectalk.html

I don't know how different is that from CallText 5010 which was, as the Wired article states, eventually bought by Nuance Communications. Still, as per Wikipedia:

https://en.wikipedia.org/wiki/DECtalk

"The CallText 5010 is still listed on Hawking's site as of 2015.[9]"