What it means is fighters get 10 bonus feats, BAB, and feats. These are static bonus. Each level they get a feat, +1 BAB an 6 avg hit points. It's linear. Then add a few static +1 bonuses on top.
The wizard get spell. Each level of spell is more power than then next by magnitude of power. So wizards power exponentially grow with each new spell level they get all the way up to level 17 and 9th level spells. They also get 5 bonus feat and some class features on top of that which grow in power and not static +1 bonuses.
Even the feats for fighter don't match up with what a wizard can pick.
So fighter is 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 and the wizard 1+9+25+49+81+121+169+225+289. It's not accurate of course but illustrates the progression of power between the two classes.