I've yet to see ANY evidence that lithium at the levels in IO is a concern, and Craig's article showing issues with C0ralife salt is certainly no justification to be concerned.
I agree that the high lithium in Coralife was a possible concern that some had. It may not have been the actual problem with that mix, but it was very much higher than IO and every other mix he tested by a factor of more than 30.
So by your reasoning, one might want to avoid salt mixes with an alk higher than NSW at 8 dKH because a different salt mix caused problems when the alk was 250 dKH higher than NSW.
One needs to pay attention to the levels involved when drawing conclusions, even if the conclusion is only that there is some evidence of a proble at much higher levels. That is likely true of many of the components of a salt mix.