Re: Brexit and Boris.
For a start, we are in the Customs Union and do not have any control over our own trade policy - something thats essential to provisioning a free port. UK membership of the EU means, we are bound by the tariffs imposed on us and therefore must apply tarrifs on goods at the port in accordance with rules of the customs union. If we attempted to create a "true" free port, any organisation in the EU (there are thousands) would be able to mothball it if it were to be giving us any competitive advantage over someone else.
Those countries with EU free trade, (Japan, Canada, South Korea etc) already benefit from 0% tarrifs so there is no advantage of having the free port in the first place.
Thats why we do not have "free ports" anymore in the EU - I think the UN declared this as well, so it's not just me saying that. This resulted in the UK not bothering to renew any of the licenses for our existing "free port in names only", such as Tilbury about 6 years or so ago.
Those "free ports" that are in the EU currently were set up before the countries joined the EU in the first place - they are as useless as ours were before we stopped licensing them.
So, in short, the link you shared backs up my argument rather than yours - I take it you haven't done your research and read it properly ? It is dated 2018 and describes the advantages of the UK having free ports post Brexit like we see in countries such as the USA. The reason being is that free ports in the EU are not like free ports anywhere else in the world - just like I said.
See your document sections 1.2 and 1.3
Facts ......