"Could you elaborate on this or add a link to an article that explores this under-mentioned reason as one of the contributing factors for the UK's decision to pull out of the EU?"

I did not make this statement. But

1. I once saw a graph that showed that the re-rise of the UK strongly correlated with oil production. The correlation does not imply causation but it was quite stunning. I looked several times for the article but did not find it again. But it made me always doubt that it was only Thatchers reforms the reinvented the UK.

2. I did not say that the UK is pulling out of the EU because of sinking oil revenues. But please consider the article that I already posted: https://hbr.org/2019/08/did-austerity-in-the-uk-lead-to-the-...

UK Oil production: https://en.wikipedia.org/wiki/Oil_and_gas_industry_in_the_Un...

So there may be a connection (less social services, less income from oil, frustrated people). London voted to stay, it was poor areas that voted "leave".