I kinda doubt it, for two reasons: that’s more work than just opening a preinstalled program and typing, and if it was cgi, I would expect something whipped together in photoshop and after effects or whatever, and not a real program.

My third reason is a little weaker: doesn’t look like it to me.

Why would they go to all the effort of making a fake phone and then CGIing in the details, when a device that looked and worked exactly as shown in the video existed in real life?