So you believe that the new rules were more directed towards EU and not much has changed for the ones outside of the EU?
There are some changes under the criminality laws for those using UK immigration rules. Mainly it seems to have added that as the UK has left the EEA, EEA/Swiss citizens and all the non-EEA citizens using EU regulations/ECJ rulings to live in/wanting to move to the UK, will now be under the much stricter UK criminality laws as there no more "EU rights" in the UK.
It's just part of the many changes to laws the UK has made to end the special treatment in the UK, of EEA/Swiss citizens and non-EEA citizens using EU regs, as the UK has ended the EU's Free Movement to the UK.
e.g. The NHS regulations have also changed too as these can no longer use the NHS for free from 1 January 2021, unless they are protected by the withdrawal agreement and can prove they reside in the UK. These now have to pay the IHS, or pay the NHS up front for treatment, or their own EU country pays.
The same with the benefit rules (no UK public funds for 5 years now) and the immigration rules (must have a visa, can now only bring a partner and children under age 18, must pay visa fees, no more self employed) etc.