They have no idea what they are talking about.
"In an Universe with not enough dark energy to push matter apart, gravity would clump everything together and we could not exist!"
Well, that "dark energy" is usually called "pressure". And it's stronger than gravity in case of gases. I want to see a computer simulation where an infinite hydrogen cloud forms a star, just because of gravity.
I found this article, it seems scientists know about pressure when it fits their story:
http://www.astronomy.com/news/2019/08/h ... into-space
How come? Why isn't our atmosphere collapsing and turning liquid because of gravity? There must be some dark repulsive energy at work.Usually, these heavier materials stay condensed in a planet’s lower atmosphere, even at scorching temperatures. But WASP-121b’s 4,600 degrees Fahrenheit is enough to loft even heavy metals high into the atmosphere, where the planet appears to be losing them.