That's the publicity shot from the manufacturer of the seats that GA are using. It is from their own PDF, I know that is quite shocking but it's true.
I've sat on the seats and it is difficult getting in and out of them compared to what you would do, but it's still possible due to the recess, but if you're a large or tall passenger it's going to be hard,, the argument from the seat manufacturer is you don't need much room from one seat to another because your knees go into the back of the bigger indentin front, which creates the space to get in and out of the seat
However if the seat has a big indent, and it's already thinner than most other seats, that doesn't say much for the padding for the back of each seat, because if it's already thin before you take into account a lot of the seat thickness is going to be used for the knees of the person behind rather than padding, you end up with a very poor seat for the work it's going to do, but it provides excellent value for money.
This allows a far smaller space between the front of one seat and the back of the next, but the argument for those seats is that the only part of your body that needs the space is your knees, and by having a hole in the back of the seat in front, that issue is resolved, however it is very claustrophobic, because the seat in front of you is closer to your torso/head/neck than any other seat I've known.