There alternatives are still harm reduction, I agree that linkrot is a real issue and that animal testing is rather neglected by most vegans. However the fact that there are alternatives to the way we do animal testing, that quite a few are due to regulatory restrictions and not necessary in the scientific sense is not false information.
I would also like to point out that this expectation of always having a well-studied understanding with sources at the ready seems to not be applied when carnists post stuff like "animal testing is necessary", "animal ag's impact on the climate is negligible" etc.