They hired a boat recently as a "trial run" and got slightly in the way of an NGO boat until the coastguard intervened.
Don't get me wrong, it's not harmless at all, but it is publicity rather than direct action. They get people like Lauren Southern and Katie Hopkins on board and make a big noise about how they're being blocked by the state from defending the white race—they will have known that there'd be practically no chance they'd be allowed to get anywhere near a boat actively picking up refugees.
The idea is to boost the concept that NGOs are aiding people smugglers with the collusion of the state (as well as boost the careers of the pundits concerned of course) and that's multi pronged. It doesn't just come from these antics, it's in assorted articles and hot takes.