It looks pretty much identical to that picture, but my thumb has no leverage sitting there to push the magazine out. I need to press straight down from above the magazine release to get enough pressure to let it out.
If that makes sense. Thumb lying on it like yours is can't release the magazine. People say this is normal, the only way I could release it like that is if my knuckle was on the button. The end of my thumb doesn't have the strength to do it.
I didn't word my original post well, my thumb reaches it I just can't release it unless I shift the gun and press straight down with the top of my thumb.