During the 1980s and 1990s, those who promoted welfare reform campaigns claimed to really be "animal rights" advocates. But the entire point of the animal rights movement was to promote a new way of thinking about animal ethics that rejected welfare campaigns as unacceptable.
At the present time, welfarists are trying to appropriate "abolition." claiming that they really want to see abolition in the long term.
Again, the point of the abolitionist approach was to refocus the animal movement on animal rights and away from welfare reform.
Think of it this way: the peace movement that rejects war. Imagine those who favor war claiming that they are part of the peace movement because they really want peace in the long-term but see war as a means to peace.
The means cannot be inconsistent with the end. War is inconsistent as a means to peace. That is the point of the peace movement. Promoting (supposedly) humane animal use is inconsistent with no use. Welfare reform is inconsistent with the abolitionist approach to animal rights.