Hello. Who told you this information? Buying this season does not offer you rewards from the previous season. Additionally, you will need to have earned the ranks of the reward to claim it.
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https://www.bungie.net/en/Forums/Post/257790766 You do not need to earn any rank to claim this. It's available from the start.
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Edited by ADragonWithin: 12/23/2020 7:17:35 AMI replied to your other response above. You don't need to earn any additional Season ranks, but you -do- need to own the Season Pass for last Season, which you don't have.