Indeed
The clue is in "If approval is granted"
"The requirement for an EU-approved pet passport is a best-case scenario. It is subject to the European Commission agreeing a British request to be considered a “listed” non-EU country that meets the necessary health requirements.
If Brussels decides to withhold approval, a more burdensome certification system will be necessary."
But the UK has stated it doesn't want to align itself with the EU.
So guess what the 'non best-case scenario' will be