I'll have to search them up again, but in my experience, evidence seldom convinces anyone of anything. Too many people have too much emotion invested in what they prefer to believe.
I've never heard of this angle before.
Why on earth would anyone on the Union side want people to know about this? It makes Lincoln look like a monster who deliberately triggered a war that killed 750,000 people to protect the financial interest of Wealthy Robber barons in the North East.
There is a good reason that people don't talk about those soldiers and ships Lincoln sent to Charleston. It doesn't fit the narrative they wish people to believe.
Many thanks