I read the article but as it was in the Guardian, I took it with a pinch of salt.
It talks about the main group of books being complained about as being those with LGBTQ+ content but doesn't give examples.
I would have liked a link to a proper breakdown of what books have been complained about, how many complaints were made by individuals, how many by organisations and naming those organisations.
I suspect a minority of complaints were made by homophobes who were unhappy about positive depictions of same sex relationships.
I think it's more likely to be people pushing back at the promotion of gender ideology. Members of a number of Women's Rights Network groups, for example, have asked their local libraries if they hold certain titles and have sometimes asked for inappropriate books to be moved from the children's section to the teenage or the adult section.