I received two contradictory emails.
May renewal
FIRST EMAIL
Thank you for your email. You are correct the additional year does take your status to May 2022, and this does include your Concorde Room card.
For your collection year from 09th May 2022 to 08th May 2023 you would currently need to earn the full 3000 Tier points to maintain Gold Guest List and 5000 Tier points for your Concorde Room card as the lower Tier points are only for the 2020-2021 collection years.
SECOND EMAIL
I have checked this with our duty desk and for your status year 9th May 2021 to 08th May 2022, you would need to earn the 3000/5000 Tier Points to earn GGL/Concorde Room for 09th May 2022 to 08th May 2023.
So effectively I am one of the 'no extension' of benefits group.