Yes, it's the truth!
You can't memorize Maths! Rote learning has been deemed as "study dead books" in chinese : du si shu. Yes you can have really good memory but knowledge learnt by pure memorization doesn't get retain long enough and most importantly, it is simply a waste of time and resources since you can't really apply what you have memorized to questions unless you have completely understand the fundamentals and the linkage.
The reason for me posting this up is that I was shocked to find one math tutor with this approach