Can you post a screenshot or mention on what category on the ToS which this statement mention? The ToS is on pdf files which means search function is not available while the full ToS is so long to read just to find this small sentence for your convenience.

By having a quick scan, I just saw in the terms that they have the right to refuse payment anytime for their own reason. This is kinda tricky on your case. Does that minimum withdrawal is available when you start being an affiliate or they just update it later on?