No. Before the epoch starts, the seed from the last macro block is used to randomly select 512 (current DevNet value) validator slots. A "slot" in that sense is like a seat in a parliament. A staker is like a party. So a staker can have multiple slots and the more someone staked the higher the chance to get those slots. During the epoch when a block is to be produced, a slot is randomly selected and the owner of that slot may actually produce the block.