This is fantastic news. I know that Golden Circle have something like this for their program, and I am very happy to see this (slowly) being introduced to Accor.
Of interest to me in Google Translating the terms and conditions:
Rewards Points have a validity period of 365 days from the date of the event that generated their credit. The Rewards Points accumulated by the Member as part of the Offer do not extend the period of validity of previously acquired Rewards Points.
So this can't be used as a way to extend Rewards Points expiry, with the one-night stay requirement remaining.
I'm also assuming that multipliers from status will also not apply.
Thanks for the post, Goldorak, and I look forward to seeing this rolled out across the program in the future!