Found these on TV Insider and TV Passport respectively, two separate listings for an episode premiering September 23rd. It is unclear what country/channel it will air on or where they found a listing this far into the future for it, but it seems legitimate.
Sources:
https://www.tvinsider.com/show/the-smurfs-2021/
https://www.tvpassport.com/series/the-smurfs/453009
(Also, if anyone has access to the English episodes that have aired in Australia, I would appreciate if they could be uploaded somewhere for us non-Australians please! It looks like it will be a while before all of those episodes come out in English in other regions.)