I think the point they might be trying to make is that there are religious and socially conservative groups that intentionally misclassify anything even remotely related to LBTQ topics as “pornography” so that anti-pornography laws can be used to silence anyone and anything that opposes their regressive views on sexuality, as one example. So it is a line that must be tread carefully.

It matters because if you can't determine if something is child porn, then you'll end up overblocking, so it doesn't matter if it "exists" and "should be censored"