How can Wilkinson Microwave Anisotropy Probe prove that other universes (hypothetical multiverse theory) had no gravitational pull on this universe?

In a video by Science Time on YouTube, the narrator says

Some scientists analyzed the data from the Wilkinson Microwave Anisotropy Probe and claimed they found evidence suggesting that our universe collided with other parallel universes in the distant past. However, a more thorough data analysis from the Wilkinson Microwave Anisotropy Probe and from the Planck satellite did not find any statistically significant evidence of universe collisions. There was no evidence of any gravitational pull of other universes on ours either.

So, how exactly does this satellite prove or add evidence to these claims that no universe collision happens or lack of gravitational pull from other universes?