I dont know what you are reading, but its nothing I said. Nature changed its working when animals arrived on the scene. Animals have a sin nature while plants dont. Animal sin is not accounted for though because they dont have the law, while humans do.
This is a misrepresentation. Shelah was not a kangaroo, but I believe was a real person (based one of the Sumerian kings). Using the meaning of his name, I show that he was also a type representing our common descendent with all therian mammals, and indicates where marsupials split off. When you count back from the birth of Isaac (who is a type of Christ), multiplying all the begat ages of the patriarchs by 365 thousand (based on 2 Pet 3:8) you arrive at approximately 130 million years ago.
100+70+29+30+32+30+34+30 = 355
355 x 365K = 130 Ma
- 2 Pet 3:8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years…
If one day with the Lord is a thousand literal years, then one year with the Lord would be 365 thousand years (365 days per year times 1,000). The patriarchs ages are in type measured in years with the Lord.
Meaning of Shelah’s name explained part way down in this earlier post from the thread you linked to: