Why don't you have an 8? Bumping your 8 up to 10 is an utter waste of stat points.
Further, Fighters don't need Charisma. Leave it at 12 for decent Will defense and an intimidate bonus. Since you're using an axe, theres no real need for Wisdom so you can dump that to 8. You can even take a -2 from it to add to strength, since you're seriously not getting hurt that badly by dropping it so low (only downside is perception, but it's unlikely you'll get it trained anyway because of your short skill list and need for feats elsewhere). You should go for high constitution, as it will really help out when combined with Boundless Endurance and Unbreakable to keep you bloodied, but alive, not to mention all the attack powers that give bonuses based on constitution while wielding an axe.
He's using the standard array with two points shifted, not a point buy system.
To OP: 20 Strength for a fighter does not suck, don't let anyone tell you that. Also, good job on avoiding the crappy trap that is sure strike. If you are planning on going with axes that's a good set-up, but unless you need Charisma for some rp or skill reason, I'd take that 12 and put it somewhere that could serve some purpose to a fighter. I'd put the 13 into Wis, since a bonus on your OAs is always nice, especially given the uncertainty of hitting in general in 4e. If it were me, I'd probably put an 8 in Cha (then modified to 10), and leave the 13 and 11 unmodified, for the stat boost they get in Paragon (since Cha is pretty much useless to a fighter and 1/3 of your career will be in Paragon, so you'll get a +1 to two stats for 1/3 of your career). It won't be optimized for the end game, but the difference is minimal, and only a dump stat feels the effect. (Ignore that if you need Cha for something, obviously)
Also, if you are allowed to and want to, a minotaur, orc, or warforged (from the MM) would be even better in terms of damage output, and you get bonus to both Str and Con, your two most important stats. The highest damage would be from the minotaur, because you get to use weapons one size larger. A maul is probably the best choice for maximum damage output with oversized, at 2d8, but 2d6 with a greataxe is nothing to sneeze at either. If you go with the maul, get Hammer Rhythm. If you stay with the greataxe, you don't need Deadly Axe, because a greataxe already has high crit
Hope that helps.