It is not surprising that Aperture requires an MacOS formatted drive. This seemingly new post may be the result of people working with betas of High Sierra and its new drive format and encountering issues.
On the other hand, it is interesting that the "Rip van Winkle" that wrote the notice is so far out of date concerning Windows drive formats and what is commonly sold today. FAT32 hasn't been a commonly used format on Windows since before Windows XP and external hard drives haven't commonly been sold using that format for quite a number of years. NTFS is the common Windows format and the common format for non-Mac specific external drives. These days, FAT32 is only common on USB flash drives and the smaller memory cards. On larger flash drives and memory cards ExFAT is the common format since FAT32 comes to grief with large volumes. The SD/XC memory card spec specifies ExFAT.