I don't remember exactly when the move started; but 'mainstream' anti-vaxers switched to the "green our vaccines"/"reduce the toxins"/"too many too soon" line some years ago to help distinguish themselves from the fringe 'Vaccines sully the bodily purity and weaken the vital essences with Aborted Fetus cells and zionist NWO population control schemes!!!' anti-vaxers.
Shockingly, this move has not led them to embrace any of the vaccines that have been reformulated by popular demand to reduce or eliminate whatever originally had them worried, nor has it led to any apparent interest in working with the toxicology people to determine what level of 'greenness'/'reduced toxins' is acceptable. Nor has there been a rush of interest to vaccinate according to some sort of reduced-pace schedule(though some individual doctors have various ones that they prefer).
Obviously, it would be hugely unethical and pointlessly cruel to advocate the use of vaccines whose risks outweigh their benefits (and, since vaccination for a selection of potentially-serious childhood diseases, as well as less common but more serious diseases, if we have the vaccine available and you are in a suitable risk group, is so enormously common, this is an area of medicine where studying safety both before and after approval is money well spent); but, despite their rhetorical shift, there appears to be no evidence that the 'We don't hate vaccines, we just want safe ones!' groups are actually at all interested in even setting goalposts that vaccines would have to meet to be accepted, much less reviewing evidence as to whether or not existing vaccines do meet those standards.
Honestly, I liked them better before their shift. There is a certain intellectual honesty to embracing a position that others see as lunacy and then fighting like a rabid weasel against all evidence. Not a...healthy...kind of intellectual honesty; but a kind of intellectual honesty. Mealy-mouthed disingenuous bullshit, though, lacks that virtue, and aggressively so. Even more cynically, it uses the cause of actual epidemiology, toxicology, and medical monitoring, safety standards, approval protocols, and other (vital) elements of keeping medicine honest and more useful than it is harmful as camouflage for a load of anti-scientific nonsense.
If they were willing to actually come out with some some sort of target (even if it seems pointlessly low according to current data), they'd just be the cautious wing of an actually scientific exercise in epidemiology and toxicology. As it is, no goals are defined, no data accepted, no improvement is ever good enough. It's pure smokescreen.