Does upgrading the 2018 Mac Mini RAM void the warranty?

I see a lot of mixed answers on this. Some say yes. Some say no. Heck, I went to an Apple Store and asked staff about it. The 1 I asked wasn't 100% sure, so he went and asked 2 others. According to them; "Yes, the RAM is user upgradable" is what they said, but I didn't press the "Does it void my warranty?" question after that. I should have. Even with that answer from Apple employees, I've mentioned this in the macrumors forums & people there said "I wouldn't trust the word of an Apple employee", which I find funny. If I can't trust the word of the staff, who can I trust on the subject?

Has anyone here done a RAM upgrade & then brought it to Apple for service? What did they do about you upgrading the RAM? Or does someone else have something more to add to this subject?

Paying $600 for an install of something that only costs $200 seems a bit over priced, even for Apple.