Egg-laying animals undergo distinct physiological states during reproduction, such as metabolic and microbiome shifts during gestation, that are comparable to mammalian pregnancy.
The retrieved papers include studies showing that oviparous vertebrates like lizards undergo profound physiological changes during gestation, such as gut microbiota restructuring (Paper 3) and hepatic metabolic regulation by hormones (Paper 5) that are directly comparable to mammalian reproductive states. None of the papers refute the claim.