Stupid question about Disk Cleaner Pro

Hello,

I'm probably going to sound like a complete idiot here, but anyway...
I have Disk Cleaner Pro installed on my MacBook Air, and there is a checkbox that says "voices". The description of it is something like "did you know your Mac can speak to you in an electronic voice? If you did not know that and don't use this feature, these files can be deleted". Am I right in thinking this will delete the voice I have downloaded and use for VoiceOver, or will it just delete the default compact voices? Only reason I'm wondering is because this is what is taking up most of the space and I assume that in my case I can't delete these, but thought I might as well check.

Thanks and sorry if I'm asking something obvious