The words of the English Bible are translations so one has to consult with a language expert to understand the nuances of meaning. So my interpretation or readings are coarse logic and for interest only in triggering alternative plausible possibilities.
There are references in Genesis to ‘Giants walking the Earth’. I have never seen any explanation of what this means. The dinosaurs were presumably extinct long before the Ark of Noah.
I have read that Satan walked the Earth and I do not see in this any contradiction or indication of fraud or lie because it is written that the Earth was formed before Adam was created in the image of the creator. The Earth was formed on one of the ‘7 Days’ or one of the ‘7 Ages’ as it may be interpreted. The Apophrica contains many passages where Adam and Eve were seemingly under attack by any number of forms and representations of Satan. So it appears from Catholic reading that Satan was walking the Earth at the time of Adam and Eve.
We don’t know how long that world existed before it was destroyed. We do know that their were dinosaurs on that earth before Genesis 1:2 but there were not in the world after verse 2. There are several references in scripture to “the world that then was”.
The flood during Noah’s time was partly due to the commingling of Demons taking human form and mating with human women which produced the “giants”.