In fact, re-reading that they don't even commit to announcing the whole month's fixtures 6 (or 5) weeks before.
They may well be announcing each weeks fixtures separately 6 ( or 5) weeks ahead of that match week.
https://www.premierleague.com/news/3599766
We will look to announce our monthly broadcast selections:
August to December: Not later than 6 weeks prior to the relevant Match Round (Match Round 1 – 20)
January to May*: Not later than 5 weeks prior to the relevant Match Round (Match...
I think the '6 weeks in advance of the first game of that month' is the only commitment made for this season.
On that basis I have Saturday 19th August in my diary for October TV picks.