no no, normally, the trolley goes straight, so since he has his hand on the lever, we can probably assume he's going to or already has pulled it.
it's also pulled in the direction of the other track already so that implies it's in the other track direction.
his posture also implies that he has already pulled it in that direction and it would be a little weird to push it the other way.
and lastly, he probably wouldn't be smiling at the people unless he had saved them, unless he takes joy in hurting others, but our evidence implies this is not true.
the main guy is only scared because they clearly don't actually know which way the tracks have been switched to, and are assuming the same thing you might when seeing this, but the smiling red guy knows they've been saves, so is happy about it.
short version : details in image imply that the rich guy has already pulled the lever to save the people!