The first two claims are not really supportable:

Human beings are the only living things that are truly aware of their own mortality and spend time pondering the meaning of life and death.[24] Awareness of human mortality arose some 150,000 years ago.[25]

The claim that only humans are aware of mortality is from an article about COVID and death anxiety by 3 psychologists, no primatologists, paleontologist or animal behavior specialist. Recently published elephant burials and long documented chimp and corvid mourning behavior could undermine this claim. Although an emotional reaction to death may not imply awareness of one’s own death.

The second claim that mortality awareness is only 150,000 years old is sourced to a 25 year old psychology paper. Our understanding of the human past has radically transformed since then. Sima de los Huesos may show mortuary practice from 400,000+ years ago, Dinaledi chamber may show non-sapiens mortuary practice from 200,000+. And if erectus (2M - 100k y/a) had fire, boats and language or proto-language well mortality awareness doesn’t seem out of the question.

There’s no good reason to think we know when awareness of death arose.