Yes, you're correct. Maybe they forgot to update weekly withdrawal fee.
But if they don't update by next weekend it is better either disable weekly withdrawal or you manually withdraw all your coins. Otherwise, you may lose some coins for paying extra transaction fees in weekly withdrawal option.
The other withdrawal fees are dynamic and the weekly is static. Do I remember correctly that they said they were going to remove the weekly withdrawal feature altogether?
weekly payments are basically a bigger batch of transactions paying a lot more users than the other withdrawal options. and it does it on the weekends which used to be less traffic on bitcoin network. in fact many services used weekends to batch transactions and get rid of a lot of dust with low fees.
for example these are latest transactions from the STATS page:
https://blockchain.info/tx/2b9dbded8bf22643fb10f1a5d6b2db06a7f8e967c47b405ac93169e0e989b01dhttps://blockchain.info/tx/395b96920fd8b3168ddb05a097d45e7bff9394dc9f6dbe83fbf120791c5ab77ethey are basically paying 1 person at a time with instant withdrawals.