Learning the techniques of jazz improvisation, comping and standard tunes is a combination of different factors.
A lot of students get impressive results with learning jazz online, but others don't.
I believe that's the case with anything in life.
Unfortunately, I think this is due to the fact that most students don't put in the amount of practice that's required to master the basics. Or they simply give up too early at the first obstacle.
All of my successful jazz guitar students have one thing in common:
They consistently play guitar.
I don't want to insult your intelligence by making any claims or promising what type of results you can get into your own playing ... like winning a Grammy, or get hired to play on Diana Krall's records.
Like with everything in life, individual results vary. And how much progress you can make with this program depends on how consistent you are with your playing, and how efficient your practice is.
The sky is the limit, but if you're lazy, nothing will happen.
Now that's out of the way ...