I was surprised when I read it too. It reflects very well on British cultural influence. Remember that a lot of the books in China were originally published in English and were translated into Chinese - whether they're counted in the 90% or not, I don't know. If they are, it would change your figures hugely. Also don't underestimate the size of the market in English speaking countries.
The link you provided is by the way per 'new title' - it makes no reference at all to the actual number of books, the type of book (instruction manual or great literature) or the size of the market. Some of those Chinese ones are probably computer printed pirate translations of work and sell a handful of copies.
American publishers grumble that only 3% of what they sell is translated from another language (translations are cheaper for them) however closer to the topic, they sell a disproportionate number of books that originate in Britain. Also, within Europe, the largest single country of origin of literature is the UK.
And don't forget e-books. Again, Britain is the European leader. Some American influence, but proportionately far more from the UK when you factor in population.
Anyway, this is in danger of going very off topic. At least we've established that in literature and high culture there's no risk or resentment of any American influence - British influence to their culture is disproportionate positively to the population sizes involved and, negatively, vice versa.
Couldn't edit because internet went off for ages, but still just about on topic since it does relate to US influence on British culture (or lack of it), albeit high culture.
It's a couple of quick links that contradict that wiki page somewhat
nownovel.com/blog/which-country-reads-the-most-books/
outthinkgroup.com/the-10-awful-truths-about-book-publishing/
They do show that American cultural influence exists but isn't excessive in Britain because there's so much cultural output.
And of course there's popular music as well...