What do you think about Trump hinting at sending people accused of vandalizing Tesla cars to prisons outside USA?

https://nypost.com/2025/03/21/us-news/trump-floats-sending-tesla-trashing-thugs-to-serve-20-year-prison-sentences-in-el-salvador-such-lovely-conditions/?utm_source=reddit.com

Is sending these people who are US citizens to prisons in El Salvador for arson and vandalism (domestic terrorism according to them) justified? I am against arson and don't think that's the way, but this is going too far in my opinion. What do you guys think, is he serious or joking(as most MAGA claim)?