I'm not sure who exactly Lansky is without more information. He could be a historical figure, a criminal perhaps, or someone with an interesting life story that has been turned into this piece of work.
It is. The movie 'Lansky' takes inspiration from the actual events and experiences of Meyer Lansky, although it might have some fictionalized aspects for dramatic effect.
Well, 'lansky a true story' might center around the individual named Lansky. It could be a story full of drama, perhaps covering his early days, how he grew up, what kind of education he had or didn't have. If he was in a complex situation like being part of a controversial group or facing difficult social or economic conditions, the story would likely explore all of those aspects. It could also look at his later years, his legacy, and how he is remembered in the context of the true events that took place in his life.
Well, to a large extent it is. The movie takes cues from the real-life story of Lansky but might have some fictional elements added for dramatic effect.