Travelling to Germany on COA right of abode stamped on non eu passport

My son has Certificate of Entitlement Right of Abode under section 2(1)(a)

He was born in pakistan and currently holding Pakistani Passport but COA is stamped on passport.

My question is:

Can he travel to EU countries without visa ?

He would need a visa if he doesn't have a British passport

Note that the COA stamp does not actually state that the holder is a British citizen. It only states that the holder has the right of abode in the UK. That is why it is acceptable in countries like India and Malaysia, which does not allow their citizens to hold foreign passports.

A German immigration officer would assess the child's right to enter the Schengen Zone based on the *passport* they carry. So, the question is not whether the child is a British citizen or not, but whether a Pakistani passport holder can enter the Schengen zone visa-free or not.