Using While Loop in __init__ to meet specific condition in Python

I am working with a senior developer who pointed out that the below code written is not the best practice.

import random


class RandomNumbers:

    def __init__(self):
        self.BASE_TEXT = ''' {} + {} '''
        while True:
            self.A = random.randint(1, 10)
            self.B = random.randint(1, 5)

            if self.A > self.B:
                break

    def generate(self):
        return self.BASE_TEXT(self.A, self.B)

I want to ensure that random number A is always greater than random number B. To meet this condition I can't think of any other way apart from using while with an if condition.

The comment I got from the senior developer is that

Neither do I understand what he means by that nor do I see any problems with code with an API response.

you cannot have something that runs randomly on the class constructor, especially since we will need an API response for it

Can someone please review the code and validate that there is no issue with the code?