Unfortunately there’s nothing we can do to change that.
To explain chmod permissions the 3 digits represent:
- file owner permissions
- group permissions
- other users permissions
7 is read write & execute
5 is read & execute
4 is read only
The only process that will touch your files here (and on most shared hosting) is run as your account. So only the “user” permissions need write permissions.
I understand that the script is saying it needs 775. But that’s a limitation of the script.
Disclaimer: I do not work for infinityFree and the above is my understanding based on my own experience both here and private hosting