Using a word tautology

As weather r Vane rightly pointed out tautology does not fit in your context.

In the context you talked about the discussions are becoming repetitive. I think they are beating about the bush

Tautology is a way of talking in which some words are unnecessarily repeated.

Example:

Your acting is completely devoid of emotion.

In the sentence above _completely _ is unnecessary because devoid means completely empty

The correct sentence is given below:

Your acting is devoid of emotion

Similarly some nonnative speakers say:

We discussed about politics

Here about is unnecessary.

Here is a link which helps you know about tautology in English.

https://literarydevices.net/tautology/