First of all, the issue is likely dosing, which you'd have to be pretty stupid to mess up. There's no toxins to mammals in the paste if it says on the label that the only active ingredient is Ivermectin. It's scare tactics, because they want you to have no alternative other than their toxic injection.

Secondly, they could solve the issue immediately by halting their program of telling doctors to withhold prescriptions for Ivermectin, but they won't do that, because they want no alternatives to be accessible to the public other than the toxic injection.