Can you give examples of such trees? I'd be interested to look at some of these :)

They are undoubtedly referring to the highly controversial Nostratic language family hypothesis, which postulates a language superfamily that includes most of the large language families of Eurasia (i.e. Indo European, Semitic, Dravidian, Uralic) and also the proposed "Altaic" family which (also controversially) is comprised Korean, Japanese, and Turkic.

Nostratic excludes the Sino-Tibetan family (i.e. Chinese languages), most languages of Southeast Asia, and all the African languages.

https://en.wikipedia.org/wiki/Nostratic_languages

Again, it's so broad a grouping, projected so far back in time and based on such weakly detected feature similarities, that it's by no means broadly accepted as a language family in the way that Indo-European, Semitic, Uralic, etc are.

Thanks for pointing out the controversy about this.

FWIW, I think it's a super interesting hypothesis, but it just doesn't have the same level of data to back it as the accepted language families do.

this would be a somewhat representative example of such a tree:

https://www.angmohdan.com/wp-content/uploads/2014/10/languag...

You can find more very easily with a google image search on "human language tree"