That’s a generalisation and not a specific description of how the EU GSP arrangement works.
The details of the EU GSP are here
Generalised Scheme of Preferences (GSP) - Trade - European Commission
Pay special attention to this part “GSP also supports EU businesses' competiveness by lowering the costs of imports from these countries“
As I handle the documentation of the goods we import from India for clearance and have done for approaching 10 years I can even tell you first hand how this works so find a comfortable seat.
When I first started we would receive from our suppliers via courier shipping documents containing the following. Commercial Invoice, 3 originals. Packing List, 3 originals. Bill of Lading, 3 originals and crucially a GSP certificate that was unique to each consignment. The GSP certificate is what allowed us to import the product we want and clear customs tariff free. That changed not that long ago. You still get 3 Commercial Invoices, 3 Packing Lists and 3 Bills of Lading however they have now done away with the GSP certificate and instead the exporter i.e. the company we buy from registers into the GSP agreement and are issued a REX number that they have to state on the Commercial Invoice and so long as this checks out the goods clear customs tariff free. The only thing we pay is VAT if the goods are remaining in the U.K. if we’re re-exporting we use the IPR scheme to waver the VAT providing the goods are re-exported within a certain period of time. We are yet to pay tariffs on anything we import from India and that will change if we revert to WTO. The vast majority of the goods we import stay in the U.K. so any tariff will either be passed on, eat into our profit or maybe even lose us a competitive edge meaning we lose orders. But according to Grendull and you we don’t benefit from the GSP. Come back and tell me that when you have some real life experience of the benefits of GSP rather than empty rhetoric and assumptions based on nothing.
I’ll accept your apology anytime you want to man up and make it.