Most of their comments have used Unicode HORIZONTAL ELLIPSIS (U+2026) which is a single … character instead of ... (three ASCII dots) which you would normally type in a comment field.

A working theory is that they were writing these comments in Word for accounting 😂

TBH I suspect it might be also a some mobile OS with auto-type feature, because I saw comments using U+2026 that clearly weren't from that group.