News of Jones' shock Crusaders appointment came out of Wales, with the Crusaders not making an announcement.
The champions will be going for a fourth consecutive title under Robertson, who was controversially overlooked for the All Black job.
Jones told Wales Online: "It's a huge opportunity and the welcome I have had in New Zealand has been fantastic.
"Without being disrespectful to other rugby clubs, the Crusaders are probably regarded as the best rugby organisation in the world. So for them to feel I can add value means a lot.
"I'm a team defence coach with the Crusaders, while I'll also be running the attack and the backs with Canterbury in the Mitre Cup at the end of the season.
"So it's a dual role that allows me to stay out here all year round.
"I've spent a couple of weeks with them already and they are everything others have said they'd be, with open-minded people who are great off the pitch and smart on it," he said.
"It's a unique environment and it's been a pleasure so far."
Jones was a big wing who played 47 tests for Wales until 2009, his career cut short by knee problems.