With as much of a handicap in tactical intelligence as mentioned here, you would think he was a headless chicken and these are said about a completely different player with all the superlatives being thrown around.
I don't think he means that. You are looking at some white/black scale here whereas it's more of a scale and on the three areas of his game, tactical that was his weakest. You can talk about world class players weaknesses though, it's fine.
For example, Messi v Ronaldo. They are the two best players of this generation, yet very different. Tactically one of them is much better than the other. One just had it from the moment he broke into first team football. The other built up that side of his game at United (likely Meulensteen's work). Ronaldo was always a physical and technical beast of a player. Messi was always a Technically and Tactically a beast of a player who had a burst of acceleration, good core strength and low center of gravity but nowhere near as physically gifted as Ronaldo. Messi will never see the game or play the game like Ronaldo does. Or vice versa. They each thrive against different sorts of opponents. Simeone can usually do a good job against Madrid for example in keeping Bale & Ronaldo quiet as they both thrive in space and comparatively struggle (as much as world class technical players can struggle) when you remain compact. In those games the likes of Modric, and recently, Isco tend to be the key to unlocking them. Then once the game opens up a little, Ronaldo can run riot on them. *
World class players are all different and all have weaknesses. Having a conversation about the weakness of Gerrard doesn't have to be a problem. The ability to mask any weaknesses in your game by imposing your will on opponents and playing to your strengths rather than let them expose those weaknesses is usually what sets apart the world class players from the rest.
* and again, this doesn't mean Ronaldo is shit against compact sides. Because this isn't black/white world where if I say he wasn't as good as Messi = shite. Just that he struggles against them more than Messi.