Yes. The logic of:
"Look, here is one single exception to a rule, therefore that debunks the whole rule."
Tantamount to people saying: "Look, my gramps smoked like a chimney through his whole life and lived to a hundred and didn't get lung cancer, therefore smoking means almost nothing in terms of developing lung cancer. Q.E.D."
And so on.
It's logic alright – just very bad logic.
Every meaningful indicator tells us that height clearly plays a big role in a person's chance of reaching the top of tennis. Cherry-picking a single player for confirmation or disconfirmation of this rule means jack squat. You have to look a the field more broadly and compare it with the general population.
In most countries, how many men are there who stand between, say, 5ft7 and 5ft10? Very, very many. (In the US, where the average height is 5ft9, this would be right in the middle of the bell curve.) And there are a fair few of them in the top 100 on tour as well, but they make up a very small share of those winning big titles in tennis. How many in the general population stand 6ft5–6ft6? Not very many. It's well to the right on the bell curve. Yet, such people are vastly over-represented in pro tennis compared to how widespread they are in the general population. Certainly so if you compare them with players who are equally many standard deviations below average height (pretty much non-existent in pro tennis). Why? Simple. Because height is a huge advantage in pro tennis. Doesn't remotely mean that the odd short player cannot defy the rule and become very good in spite of their height.