I found this claim to be false. NASA has found a lot of exoplanets and has confirmed 6160 exoplanets out of the billions that they think exist. But NASA has not yet confirmed that it can support people like Earth can, and that there are no findings of life beyond Earth. This shows that the claim made is false because they have not found anything, and there is no evidence to support their claim. https://science.nasa.gov/exoplanets/
I used the NASA website as my source because it relates to this claim and provides evidence for it. NASA says that they have not found life on other planets besides Earth so far, and they also don't have evidence of life beyond Earth. https://science.nasa.gov/exoplanets/is-there-life-on-other-planets/
NASA is a reliable source because this is what they are looking for, they are doing research and studies for the planets and space. NASA likes to share exciting new findings that they find and back them up with good reasons, which is why I trust looking at the NASA website.
NASA has said they have discovered other planets, in "habitable zones" but haven't found any information if there is life like Earth on them. They have said they have found places that have "liquid water on the surface," but that's all they have said.