I don’t know how much simpler we can make it.

Your current tier point collection year ends 8SEP23. If you don’t collect 600 tier points before 8SEP23 you will drop to bronze status on 1NOV23. Until 1NOV23 BAEC allows you to keep your silver status.

Your new tier point collection year starts on 9SEP23 and continues to 8SEP24. To achieve silver status during that collection year you need to earn 600 tier points. Whenever you earn the required tier points to attain or retain a status you earn it for the rest of that collection year and the next year.

To use this “trick” (which is not really a trick) if you have failed to requalify for status, is fly the necessary tier points (in your case 600) during your new collection year that starts 9SEP23. The “trick” is if you earn those 600 before 1NOV23 you will never have dropped to bronze. In actuality all you are doing is attaining silver in your new collection year.