I think his point was you won't be able to Challenge in European Courts soon - And in the UK Courts you don't appeal against the Law. You appeal against the ''Interpretation of a law'' in civil cases - In criminal cases appeals are usually based on a Jury or a judges interpretation of facts...
All of them . Because every Law they pass becomes the new Law . Thus making everything they do "Lawful".
If Boris Johnson wants to ban the wearing of nickers outdoors now he can do
Look at all the ''Non Working Class'' Conservatives who had the option of increases in their Benefits a month ago and they didn't even have the sense to tick the correct box in a Voting Slip