An electric bike will be a good bike for helping you get into better shape however it won't be a very good bike for doing centuries or touring.
I don't know this bike I'm going to let the others review it for you.
What I would recommend is use an electric until you outgrow it (no longer feel that you need an assist). Keep it. It will always be a good commuter/grocery getter.
But when you are ready something like the Surly Long Haul Trucker (commonly called the LHT) will be an excellent bike for centuries and touring.
Bikes are very job specific but the LHT is a very good all around bike.
I'm not saying don't consider the electric, I think it may be the best way to help you get into the shape you want. And when you get there you will always find use for it.
I suffered a spinal injury and bought my first ebike to help me regain my strength. Now I have a stable of bikes but still love my Giant. I ended up adding an XtraCycle kit to it (an extended rear end for large cargo carrying capability) and it makes for a great cargo hauler.