Wrong again.malayalam is the easiest of all the south Indian languages to learn.malayalam not only doesn't follow sub verb agreement but also gender verb agreement(both Kannada and Tamil also don't follow in their spoken but do in written form)
I will give an example for you to understand better
Let us take a sentence ' he will come'
It is avan varum in Malayalam where as athanu vasthadu in Telugu.
Now let us change gender of the subject
aval varum(she will come )
ame vasthundi in telugu
Verb changed according to gender of the subject
Now let us change the number of the subject
Avar varum(they will come)
Vaaru vastharu in Telugu(verb changed according to the number of subject)
Now we will change the person of the subject
Nyaan varum(I will come )
Avan/aval/avar varum
No change of verb according to person also
In Telugu it is neni vasthanu,nuvvu vasthavu,athanu vasthadu
As you might have noticed there isn't any change in the verb in malayalam according to person,gender or number like Telugu.Bcoz of this a Telugu person finds it easy to learn malayalam whereas as a malayali finds it hard to learn Telugu