"THE Alba Party's plan to re-enter the EU will involve seeking European Free Trade Association (EFTA) membership"

So instead of simply joining the EU they want a "trade pact" with Brussels, which means we won't actually be in the EU but still need to pay them huge sums of money and follow their rules n laws.

https://www.thenational.scot/news/19204194.kenny-macaskill-hints-albas-eu-re-entry-different-snp/