Your best bet is russian torrent trackers, like rutracker (you'd probably need to use a VPN though).
You could also check the russian social media platform VK for a dedicated group, but I don't know what state it's in (haven't used it in almost 10 years). The owners also have ties with the russian government, so use it at your own risk😅
I think they are either refering to child labor in cobalt mines, which was used for Tesla power elements, or to his father's emerald mines. There's no evidence of direct people-owning slavery in either case, still a lot of shady and immoral (and probably illegal) practices to earn money in both of them.
I mostly left because I saw an abundance of bootlicking posts and comments, people dunking on mods for continuing the protest and saying that it doesn't concern them cause they don't use third-party apps. Granted, some of them might've been bots or payed, but a lot of frustration seemed genuine and fron real accounts, and it rubbed me the wrong way.
ALL OF THEM (except for exploding-heads, of course)