That’s because the NTFS driver for Linux has no real support for NTFS permissions. So it would be " … and NTFS on Linux …". But everyone using NTFS on Linux should know about the issues NTFS has on Linux, so IMHO there is no point in explicitly mentioning it in Syncthing.
I agree with wweich here. NTFS does everything we require of it* in Windows. NTFS-under-Linux limitations are not NTFS limitations, they are the Linux NTFS driver limitations. We shouldn’t give driver specific advice in the cross platform GUI.
*) Which is on the other hand very little, as we essentially only support the read-only bit on Windows.