When someone on the right parrots a blatant, provable falsehood that is doing the rounds in their media ecosystem, never assume they genuinely believe it. The vast majority are not that stupid, what they are doing is hoping that it will become accepted as true by people dumber than they are if it's signal booster enough, and that the world will be so polluted by small lies, the big ones will be harder to spot, as will the real agenda.
Look at how the right embraced the litter boxes in schools lie, everyone just knew someone who worked on a school who saw it, when nobody did, and that 'real fact' became a part of the groundwork for attack on trans healthcare for kids. 'Schools enable furries, therefore furries are widespread, therefore gender non conforming kids are everywhere and have easy access to pills and surgery, encouraged by teachers, doctors and social media, so that must be stopped, and trans care for older people too to stop the social contagion!' The attacks on all trans people was the point, the litter box was only ever groundwork for that.
If you want the seeds of inhumanity to grow, you need to fertilize the ground with a lot of bullpoop.