There is the idea of Singapore as a small plucky low-tax, small-government country that's extremely high growth and well-off by being at "the gates to Asia" as a trade and manufacturing hub.
And the idea is that an independent UK could be the same for the (slow, inflexible) EU. Which ignores that Singapore actually has high government investments in industries and does the hub role so well because it has good trade integration with its neighbors. Which the UK had in the EU, but could only expect to keep in a Brexit that strongly aligns it with EU policy (which would stop it from giving too much preferential treatment to its own industries etc)
And the idea is that an independent UK could be the same for the (slow, inflexible) EU. Which ignores that Singapore actually has high government investments in industries and does the hub role so well because it has good trade integration with its neighbors. Which the UK had in the EU, but could only expect to keep in a Brexit that strongly aligns it with EU policy (which would stop it from giving too much preferential treatment to its own industries etc)