DN 16 or the entire DN/DA is a very late EBT according to Ven. YinShun’s The Formation of Early Buddhist Texts:
“Earliness” of Pali Suttas vs Chinese Agamas - Discussion - Discuss & Discover
The Samyutta Nikaya as the earliest of the EBTs - Discussion - Discuss & Discover
According to the core teachings of the so-called sutra-anga portion of SN/SA, the Buddha is physically just a human.