The Brexit vote was a decade ago and though many mourn the outcome, it’s a bit late to be erecting artwork about it. References to being blinded by a flag now are probably about the particular far-right organizing of the last year or so that employs the English and UK flags in a very particular way. [0]

[0] https://en.wikipedia.org/wiki/Operation_Raise_the_Colours

This campaign, which has been highly visible on social media and in physical neighborhoods, claims to promote patriotism. However, it has been deeply polarising, with critics and anti-racism groups arguing it is being used by far-right groups to mark territory and intimidate immigrant communities.

I feel more that it is a commentary on "blind nationalism" of which Brexit is one example, but not the only one, or the most recent. Brexit may be "over" now, but the mindset is still very much with us in the UK and elsewhere. In other words, any successful art relates to more than one specific situation, and allows more than one reading.