Fair enough, although it seems unlikely, being such an extraordinary number. Perhaps we could at least agree that the increase due to excessive social media use among the Amish is likely much lower (as it is in those in the general public who do not partake?).
In any case, the Amish are not a serious social comparison, they are a curiosity, and nothing we can say or speculate about their failings will make ours any less. Does China have this problem? Did the US have it 20 years ago? [SPOILER: no] Is turning our children over to exploitative corporations and addictive algorithms likely to result in good outcomes? Do we have any data about this?
You can't swap in a lack of evidence as "evidence of zero."
We have no reliable information on how many Amish girls want to kill themselves, so there's no way to compare the two groups in that specific aspect.